ADVANCED IOL POWER CALCULATIONS. Jack T. Holladay, MD, MSEE, FACS
|
|
|
- Louise Dennis
- 10 years ago
- Views:
Transcription
1 Jack T. Holladay, M.D., M.S.E.E., F.A.C.S. ADVANCED IOL POWER CALCULATIONS Jack T. Holladay, MD, MSEE, FACS I. Formulas and Measurements A. Variables Used to Predict ACD 1. Binkhorst AL 2. Holladay AL, K 3. SRK/T AL, K 4. Hoffer Q AL, K 5. Olsen AL, K, ACD 6. Clarke AL, K1, K2 ACD, LT 7. Holladay AL, K, HWTW, REF, ACD, LT, AGE B. Normal Values for required Measurements 1. Axial Length: mean = 23.5 mm, SD = 1.25 mm 2. Keratometry: mean = D, SD = 1.6 D 3. Horizontal White-to-White (Corneal diameter): mean = 11.7 mm, SD = 0.46 mm 4. Preoperative Refraction: mean = plano 5. Anterior Chamber Depth (ultrasonic): mean = 3.1 mm, SD = 0.30 mm 6. Crystalline Lens Thickness (ultrasonic): mean = 4.7 mm, SD = 0.41 mm 7. Age: mean = 72, SD = 12 years II. Axial length Measurements in Aphakic and Pseudophakic eyes A. Aphakia M/sec B. Pseudophakia 1. PMMA M/sec 2. Silicone M/sec 3. Acrylic M/sec III. Determination of corneal power following Keratorefrative Sx (PRK, LASIK, RK) A. Manual Keratometry B. Automated Keratometry C. Corneal Topography D. Calculation from pre- keratorefractive surgery K s E. Determination from hard contact lens trial IV. Data Screening Techniques on Preoperative Measurements A. Probability of unusual measurements (one eye only) B. Probability of asymmetrical measurements (both eyes) V. IOL Calculations requiring Axial Length Measurements A. Standard Cataract Removal with IOL 1. Piggy-Back IOL s: Use 34 D IOL posterior in bag 2. Multifocal IOL s: Target distance plano, near for D. 3. Toric IOL s: IOL Cylinder to Corneal Cylinder ~ 1.46, but not exact for low (1.75) and high (1.20) power IOLs a. Optimization of Cataract Incision Location: Normal 4 locations for zero residual astigmatism b. Back calculation for surprise: 1) P.O. Refraction &, 2) P.O. Ks OR Current IOL axis B. Cataract Removal with IOL and Silicone in Vitreous: use convexplano ~ 3 D more, for biconvex ~ from 5-6 D more in IOL. Page 1 of 2
2 Jack T. Holladay, M.D., M.S.E.E., F.A.C.S. VI. IOL Calculations not requiring Axial Length A. Secondary Implant for Aphakia: in sulcus or anterior chamber angle B. AC IOL in phakic patient: High myopia ( - IOL) & High hyperopia ( + IOL) C. Secondary Piggy-Back IOL for high hyperopia (or myopia within 1 year) VII. Pediatric IOL calculations A. Ideal Postoperative Target Refraction: plano to D. B. Expected Myopic Shift with age: 4 D from age 2 to age 21. VIII. Minimizing Prediction Error A. Personalizing Formula Constants (A-const, ACD or Surgeon Factor) B. Prediction Error vs. IOL Power C. Creating personalized constants for subgroups 1. Axial Length (< 22 mm or > 26 mm) 2. Keratometry (< 40 D or > 48 D) 3. Preoperative Refraction (< -4 D or > +4 D) IX. Calculating SIRC (Surgically induced refractive change) A. From pre and post operative keratometry B. From pre and post operative refraction X. Outcomes Analysis A. Prediction Error Analysis: Mean absolute prediction error should be < 0.50 D. B. Formula Comparisons: more predictors, better results in unusual eyes C. SIRC Results: Astigmatic Analysis D. Visual Acuity Results 1. Best corrected 2. Uncorrected XI. Back-calculations A. For determining source of error with refractive surprise B. Comparison of back-calculated lens constant and actual lens constant Page 2 of 2
3 3/28/2014 JTH 1 Advanced IOL Power Calculations Jack T. Holladay, MD, MSEE, FACS Clinical Professor of Ophthalmology Baylor College of Medicine Houston, Texas, USA Financial Disclosure I have the following financial interests or relationships to disclose: Acufocus Consultant Alcon Consultant AMO Consultant Oculus Consultant Visiometrics Consultant Wavetec Consultant Zeiss Consultant Jack T. Holladay, MD, MSEE, FACS Clinical Professor of Ophthalmology Baylor College of Medicine Houston, Texas 3/28/2014 JTH 6 Fax: /28/2014 JTH 19 7 Vergence Formula 3/28/2014 JTH 20 3/28/2014 JTH Theoretical Formula has not changed in 173 years Physiologic Assumptions may be slightly different Retinal thickness Corneal Index of Refraction JACK T. HOLLADAY, MD, MSEE, FACS Page 1 of 23
4 3/28/2014 JTH 23 Vergence Formula IOL ALELP 1336 ELP 1000 K 1000 DPostRx V 3/28/2014 JTH 24 E L P Effective Lens Position Distance from corneal vertex to principal plane of thin IOL (no thickness) Same as ACD, but avoids confusion with anatomy Prediction of E L P <1980 Constant (0) Binkhorst 2 (1) AL 1988 Holladay 1 (2) AL, K 1995 Olsen (4) AL, K, ACD, LT 3/28/2014 JTH 25 3/28/2014 JTH 26 3/28/2014 JTH 27 Prediction of E L P 1996 Holladay 2 (7) AL, K, ACD, LT, HWTW, REF, AGE 3/28/2014 JTH 28 Investigation International Study investigators (15 U.S.) Additional measurements are taken 35 eyes < 21 mm 35 eyes > 26 mm 35 eyes = normal JACK T. HOLLADAY, MD, MSEE, FACS Page 2 of 23
5 3/28/2014 JTH 31 Measurements taken for Predictors of ELP Axial Length Average K Horizontal WTW ACD LT Pre-opRefraction Age 3/28/2014 JTH 32 HWTW Gauge Horizontal Corneal Diameter ASICO # AE 3/28/2014 JTH 33 3/28/2014 JTH 34 ASICO # AE Normal Eyes Short Eyes ( < 21 mm) # of Cases N = % 2% 2% Small Normal Large Anterior Segment Size # of Cases % N = 93 20% 0% Small Normal Large Anterior Segment Size 3/28/2014 JTH 37 3/28/2014 JTH 38 JACK T. HOLLADAY, MD, MSEE, FACS Page 3 of 23
6 Long Eyes ( > 27 mm) Normal Physiologic Values # of Cases N = % 0% 10% Small Normal Large Anterior Segment Size Al: 23.5 mm mm K: D D Hwtw: 11.7 mm mm Ref: D D 3/28/2014 JTH 39 3/28/2014 JTH 40 Normal Physiologic Values ACD: 3.1 mm mm LT: 4.7 mm mm Age: 72 years years Critical Data Corneal Power Optical Axial Length Horizontal White-to-White (11.7) AC angle = WTW (12.7) Sulcus = WTW (13.2) Bag = WTW 1.0 (10.7) 3/28/2014 JTH 41 3/28/2014 JTH 42 3/28/2014 JTH 43 CONCLUSION Eye Model must include NINE types of eyes not only THREE Anterior Segment Size Large Normal Small 3/28/2014 JTH 44 CONCLUSION: 9 EYES Megalocornea Large Eye + axial Megalocornea Buphthalmos hyperopia Megalocornea + axial myopia (0%) (2%) (10%) axial hyperopia normal axial myopia (80%) (96%) (90%) Small eye Microcornea Nanophthalmia Microcornea + axial opia (20%) (2%) (0%) Short Normal Long Axial Length JACK T. HOLLADAY, MD, MSEE, FACS Page 4 of 23
7 Relative Importance of Predictors for ELP Axial Length 100 Average K 76 Horizontal WTW 24 Refraction 18 ACD 8 LT 7 THE HOLLADAY 2 FORMULA More Measurements More Accuracy Age 1 3/28/2014 JTH 47 3/28/2014 JTH 45 FORMULA PERFORMANCE CONCLUSIONS Mean Absolute Error (D) N = Axial Length (mm) Holladay 1 Hoffer Q SRK/T Holladay 2 Prediction Errors in Short Eyes: significantly improved by more measurements Prediction Errors in Long Eyes: due to bad Axial Lengths, B-Scan 3/28/2014 JTH 49 3/28/2014 JTH 50 Myopic Staphyloma 3/28/2014 JTH 52 3/28/2014 JTH 53 JACK T. HOLLADAY, MD, MSEE, FACS Page 5 of 23
8 Subtract from Ascan measured Axial Length ~ 0.8 mm J Cataract Refract Surg 2011; 37: Zaldivar-Holladay JCRS May 2000 Zeiss 3/28/2014 JTH 54 - IOL Master /28/2014 JTH 55 Linear Regression to compensate for AVERAGE Index of Refraction in Long Eyes 3/28/2014 JTH 56 Zeiss-Humphrey IOL Master LenStar Difficult Cases Asteroid Hyalosis (vit. debris) Extreme Length (26.5 mm) Uses Average Index Too Long Extreme Short (< 21 mm) Pseudophakic Eyes Silicone in Vitreous 3/28/2014 JTH 57 Cataract Surgery IOL Power Calculations Following Refractive Surgery Preoperative Assessment Endothelial Cell Count Pachymetry Direct 16 Corneal Topography Determining Corneal Power IOL Calculation 3/28/2014 JTH 60 3/28/2014 JTH 61 JACK T. HOLLADAY, MD, MSEE, FACS Page 6 of 23
9 3/28/2014 JTH 62 3/28/2014 JTH 63 3/28/2014 JTH 64 Corneal Power after LASIK, PRK, RK Ideally, Calculation from both surfaces Calculation from Prior Data Trial Hard Contact Lens Corneal Topography Automated Keratometry Manual Keratometry Pachymetry and Posterior Corneal Surface 3/28/2014 JTH 66 New patented laser cross for measurement of posterior corneal surface and optical pachymentry 3/28/2014 JTH 81 3/28/2014 JTH 82 JACK T. HOLLADAY, MD, MSEE, FACS Page 7 of 23
10 3/28/2014 JTH 85 3/28/2014 JTH 86 ADVANCED IOL CALCULATIONS mm OZ with 6 cuts ~~ D 3/28/2014 JTH 83 3/28/2014 JTH 84 3 mm pinhole Rigid Contact Lens Trial Frame 3/28/2014 JTH 87 3/28/2014 JTH 88 JACK T. HOLLADAY, MD, MSEE, FACS Page 8 of 23
11 1. Calculation from Prior Data (Pre K & Δ MR known) Pre KR Mean K = D Change in SEQ Ref = D Calc Mean K = D 3/28/2014 JTH 89 3/28/2014 JTH Calculation from Prior Data (Post Std. K s & Δ MR only) Post Mean K = D Change in SEQ Ref = D STD K s: * SEQ = Calculation from Prior Data (Post Ctr Top Power & Δ MR only) Post Mean K = D Change in SEQ Ref = D Ctr Top: * SEQ = Calc Mean K = D Calc Mean K = D 3/28/2014 JTH 91 3/28/2014 JTH 92 3/28/2014 JTH 93 3/28/2014 JTH Trial Hard Contact Lens (Rigid Contact lens only) Plano HCL Base Curve = D SEQ Ref without CL = D SEQ Ref with CL = D Front K = = D D 10% (4.50) = D Mean K = D JACK T. HOLLADAY, MD, MSEE, FACS Page 9 of 23
12 Post-operative Initial Hyperopic Shift Long Term Hyperopic Drift ATR Astigmatism Drift 3/28/2014 JTH 95 3/28/2014 JTH 96 3/28/2014 JTH 97 3/28/2014 JTH 98 3/28/2014 JTH 99 3/28/2014 JTH 100 JACK T. HOLLADAY, MD, MSEE, FACS Page 10 of 23
13 Accuracy of EKR Prior STD 4.5 Sx (D) LASIK 0.56 RK /28/2014 JTH 101 3/28/2014 JTH 106 Holladay JT, Hill WE, Steinmueller A. Corneal Power Measurements Using Scheimpfl ug Imaging in Eyes With Prior Corneal Refractive Surgery. J Refractive Surgery 2009:25: (October 2009 Issue of J Refr Surgery) 3/28/2014 JTH 111 3/28/2014 JTH 112 Holladay Report Equivalent Keratometric Power 3/28/2014 JTH 113 3/28/2014 JTH 114 JACK T. HOLLADAY, MD, MSEE, FACS Page 11 of 23
14 3/28/2014 JTH 115 3/28/2014 JTH 116 Normal LASIK RK 41 to 44 D 3 D Range 36 to 41 D 5 D Range 32 to 45 D 13 D Range Summary Optimal Zone LASIK: 4.5 mm RK: 5.0 mm Customize for small/large pupils Accuracy LASIK: ± 0.56 D RK: ± 0.94 D Error on MYOPIC side 3/28/2014 JTH 118 IOL CALCS in Keratoconus Corneal is Bifocal Patient does not look through cone for distance (may use at 10 cm as magnifier Look at Power Distribution Use Paracentral Power Keratoconus #1 3/28/2014 JTH 119 (65% Mean Power) 3/28/2014 JTH 120 JACK T. HOLLADAY, MD, MSEE, FACS Page 12 of 23
15 Keratoconus #1 Keratoconus #1 #1 3/28/2014 JTH 121 3/28/2014 JTH 122 Keratoconus #1 ` Keratoconus Calculation #1 OS Used Km = 46.5 D => D Should have used 65% Mean 45.5 D => plano should have targeted D (-0.50 always better than +0.50) 3/28/2014 JTH 123 3/28/2014 JTH 124 3/28/2014 JTH 125 Keratoconus Calculation #2 Dear Dr. Holladay, > Will you please review this case and give me some insight. A KKC with Intacs patient undewent ECCE/IOL the doc targeted -4.OO so as to not make him anisometropic. I used the Pentacam 3.0mm zone EKR and the Holladay ll formula. The patient came out Pl -0.75x 135= 20/30! UCVA = 20/40. Patient is very very happy. But, this was an unintended outcome. How does one measure the central corneal power in an Intacs pt?. Can you determine the cause of this outcome?. It appears that the cornea must be flatter than what the instruments measured? Is that a correct assumption. The suggested IOL power was 26.0D. for a target 0f When I click the keratoconous box (after the fact) for the same target the suggested IOL power was ?????? What should I have done differently! > > Please Advise! THANK YOU 1000x > Yvonne 3/28/2014 JTH 126 Keratoconus #2 JACK T. HOLLADAY, MD, MSEE, FACS Page 13 of 23
16 Keratoconus #2 Keratoconus Calculation #2 Used Km = D => Plano, but targeted for D Should have used 65% Mean 37.7 D => D If had KKC => D (not will use steeper K to size eye) 3/28/2014 JTH 127 3/28/2014 JTH 128 Keratoconus Case #3 Dear Dr. Holladay, I am so pleased and excited to tell you about a very successful outcome involving IOL calcs on KCN patient and the assistance Holladay distribution scale on the Pentacam. I thought you might find this case interesting and gratifying at the least. Pre Op Refraction: x 075= 20/40 IOLM ks 47/54.17 x 91 1wk Post-Op Refraction : X65 = 20/50 The surgeon placed a temporal suture. Will this 1 suture significantly impact the astigmatism? I ran IOL calcs based on instructions you gave me on a similar case,previously. You instructed me to use the Ks from a paracentral region derived from the EKR Distribution scale on Holladay report. I used the Ks from the smaller peak which I approximated to be about 44D. With those Ks and Holladay consultant we obtained the above results. I think this case demonstrates the invaluable utility of the Holldaday report when calculating IOL power in pts with KCN. I attached the screenshots of Pentacam and IOL calcs. The technician who perfromed the IOL Master was unable to get ACD with IOLM and failed to get ACD with Immersion ultrasound- thats the reason that field is blank. Yvonne 3/28/2014 JTH 129 3/28/2014 JTH 130 Keratoconus Calculation K mean = 48.8 D Used 44 D => SEQ = D ( X65 = 20/50) 65% mean = 46.2 D => D Always KKC Use 65% mean K 3/28/2014 JTH 131 3/28/2014 JTH 132 JACK T. HOLLADAY, MD, MSEE, FACS Page 14 of 23
17 IOL Calcs Using Axial Length Cataract or Clear Lens Removal Primary Piggy-Back IOL s Multifocal IOL s Toric IOL s Silicone in Vitreous Compartment Axial Length Measurements Phakia AL 1555 Aphakia AL 1532 Pseudophakia PMMA AL Silicone AL Acrylic AL /28/2014 JTH 133 3/28/2014 JTH 134 Primary Piggy-Back IOL s Primary PIGGY-BACK INTRAOCULAR LENSES Current Formulas are very inaccurate ELP underestimated due to AL Back lens displaced posteriorly Severe hyperopic errors (+5 D) 3/28/2014 JTH 135 3/28/2014 JTH 136 Polypseudophakia Up to 4 IOL s 3/28/2014 JTH 137 3/28/2014 JTH 138 JACK T. HOLLADAY, MD, MSEE, FACS Page 15 of 23
18 3/28/2014 JTH 139 3/28/2014 JTH 144 PIGGY-BACK INTRAOCULAR LENSES J.T. Holladay Jane Leidlein James P. Gills Myra Cherchio Achieving Emmetropia In Extremely Short Eyes With Two Piggy-Back Posterior Chamber Intraocular Lenses. Ophthalmology Journal. Vol July 1996 Blue Journal Primary Piggy-Back Complications Acrylic Interlenticular membrane 3 to 5 D hyperopic 3 yr Silicone Interlenticular membrane Flat Spot Minimizing Prediction Error Holladay 2 Formula Personalize Constant Prediction Error vs. IOL power Constants for Sub-groups Axial Length, K s and Refraction 3/28/2014 JTH 148 3/28/2014 JTH 153 3/28/2014 JTH 158 Toric IOL s Current Formulas do not work because calculate different ELP for steep and flat meridian Predicted ELP must be the same for each meridian -- only one IOL position 3/28/2014 JTH 160 Toric IOL s Calculate IOL power for steep and flat meridian using same ELP Difference in IOL powers is the toricity necessary to completely correct corneal astigmatism JACK T. HOLLADAY, MD, MSEE, FACS Page 16 of 23
19 Toric IOL s Always choose toricity to undercorrect corneal astigmatism WRONG! LEAVE MIN RESIDUAL CYL! Eg: Steep calc yields 24.0 D Flat calc yields 27.0 D Ideal Toricity is 3.0 D 3/28/2014 (Use JTH D with < 3.0 D of toricity) Ratio and Power of IOL Cylinder to Corneal Cylinder TABLE 1 Effective Lens Position (ELP) A-constant > Surgeon Factor > ELP > IOL POWER Resulting Ratio of IOL Toricity to 2 D of Corneal Astigmatism TABLE 2 Effective Lens Position (ELP) A-constant(D) > Surgeon Factor(mm) > ELP(mm) > IOL POWER Required IOL Toricity for 2 D of Corneal Astigmatism /28/2014 JTH 165 3/28/2014 JTH 166 3/28/2014 JTH 167 Dioptric Error vs. Angular Error for a 1.00 D of astigmatism 3/28/2014 Jack T. Holladay, M.D. % Error Angle Error ( ) Dioptric Error (D) % % % % % % % Dioptric Error = 2 * Cyl * sin (angular error) 168 JACK T. HOLLADAY, MD, MSEE, FACS Page 17 of 23
20 3/28/2014 JTH 172 3/28/2014 JTH 173 PREOP 6 D Toric IOL PREOP 6 D Toric IOL -- OD LEFT LEFT 3/28/2014 JTH 174 3/28/2014 JTH 175 PREOP 6 D Toric IOL -- OS LEFT Mean Dev = D 3/28/2014 JTH 176 3/28/2014 JTH 178 JACK T. HOLLADAY, MD, MSEE, FACS Page 18 of 23
21 3/28/2014 JTH 179 Silicone in Vitreous Cavity Use Convexo-Plano IOL to minimize effect of Silicone (add 3 D to calculated IOL) If Biconvex IOL (add 6 D to calculated IOL) When Silicone removed -- 2 to 5 D of induced myopia 3/28/2014 JTH 180 IOL Calculations using a Refractive Formula (ignore axial length) IOL Calculation without AL REFRACTION FORMULA Secondary AC or PC IOL for Aphakia Secondary Piggy-Back AC or PC IOL for Pseudophakia Primary AC IOL in Phakia IOL ELP 1000 K 1000 PreRx V ELP 1000 K 1000 DPostRx V 3/28/2014 JTH 181 3/28/2014 JTH 182 Secondary Piggy-Back IOL s Indications Intolerable Pseudophakic Refractive Error Refractive Surprises Previous RK, PRK, LASIK Bad axial length - short/long Mislabeled IOL Axially displaced Misc. 3/28/2014 JTH 183 3/28/2014 JTH 184 JACK T. HOLLADAY, MD, MSEE, FACS Page 19 of 23
22 Secondary Piggy-Back Calc Advantages over Exchange Mislabeled IOL irrelevant Less risk to capsule or zonules Mismeasured AL irrelevant No AP shift of existing IOL Fewer unknown variables 3/28/2014 JTH 185 3/28/2014 JTH 186 3/28/2014 JTH 187 3/28/2014 JTH 200 IOL Power Calcs for Phakic IOLs (2º Piggy-Back & IOL Exchange after Refractive Surprise) Phakic IOL s Compete with corneal refractive procedures for high myopia and med & high hyperopia ACL, ICL or Iris Clip? 3/28/2014 JTH 201 Jack T. Holladay, MD, MSEE, FACS Clinical Professor of Ophthalmology Baylor College of Medicine 3/28/2014 JTH 202 Houston, Tx JACK T. HOLLADAY, MD, MSEE, FACS Page 20 of 23
23 Phakic IOL s (Secondary Piggy Back IOL s) Refraction Formula 3/28/2014 JTH 203 3/28/2014 JTH 204 3/28/2014 JTH 206 Phakic IOL Calculation Input Variables Refraction and Vertex Keratometry Desired Refraction Predict ELP (ACD) Effective Lens Position IOL 3/28/2014 JTH 207 REFRACTION FORMULA ELP 1000 K 1000 PreRx V ELP 1000 K 1000 DPostRx V Holladay, J.T.: "Refractive Power Calculations for Intraocular Lenses in the Phakic Eye." American Journal of Ophthalmology. Volume 116:63-66, July Phakic IOL Calculation Input Variables Refraction and Vertex Soft Contact Vtx = 0 w Small Over-Refraction (< ±2 D) is most accurate. Effective Lens Position (ELP) OLD ACD Verisye Avg ELP = 4.27 mm AACD (20 y/o) = 3.60 mm AACD mm = ELPx 3/28/2014 JTH 208 3/28/2014 JTH 209 JACK T. HOLLADAY, MD, MSEE, FACS Page 21 of 23
24 Effective Lens Position (ELP) OLD ACD Visian ICL Avg ELP = 4.00 mm Effective Lens Position (ELP) OLD ACD Visian ICL Avg ELP = 4.00 mm AACD (20 y/o) = 3.60 mm AACD mm = ELPx 3/28/2014 JTH 210 3/28/2014 JTH 211 Phakic IOL Calculations + IOL s to Specs ~ 1.5 to 1 - IOL s to Specs ~ 1.0 to 1 Approximation only 3/28/2014 JTH 212 3/28/2014 JTH 217!!! Thank you!!! 3/28/2014 JTH 219 3/28/2014 3/28/2014 JTH 222 Jack T. Holladay, M.D. 222 JACK T. HOLLADAY, MD, MSEE, FACS Page 22 of 23
25 Pediatric IOL Calculations Ideal Refraction: plano to -1 D Expect average of 4 D myopic shift from age 2 to 20 Much easier to correct myopia at age 20 than amblyopia Minimizing Prediction Error Holladay 2 Formula Personalize Constant Prediction Error vs. IOL power Constants for Sub-groups Axial Length, K s and Refraction 3/28/2014 JTH 223 3/28/2014 JTH 224 Surgically Induced Refractive Change SIRC From Keratometry Cataract & Clear Lensectomy Keratorefractive Sx. From Refraction Keratorefractive Sx. 3/28/2014 JTH 225 3/28/2014 JTH 226 Outcome Analysis Prediction Error (50% < 0.50 D) Formula Comparisons Induced Astigmastism (SIRC) Visual Acuity Best Corrected Uncorrected Back-Calculations Thank you! Helpful in determining cause of refractive surprise Back-calculated K, AL and IOL power compared to pre-op & to post-op remeasured values Back-calculated ELP compared to preoperative prediction by formula 3/28/2014 JTH 227 Sydney The International Society of Refractive Surgery April 23,2002 JACK T. HOLLADAY, MD, MSEE, FACS Page 23 of 23
ADVANCED IOL POWER CALCULATIONS. Jack T. Holladay, MD, MSEE, FACS
Jack T. Holladay, M.D., M.S.E.E., F.A.C.S. ADVANCED IOL POWER CALCULATIONS Jack T. Holladay, MD, MSEE, FACS I. Formulas and Measurements A. Variables Used to Predict ACD 1. Binkhorst 2-1981 - AL 2. Holladay
IOL Power Calculation After Myopic LASIK. Hany Helaly, Lecturer of Ophthalmology, Faculty of Medicine, Alexandria University.
IOL Power Calculation After Myopic LASIK Hany Helaly, Lecturer of Ophthalmology, Faculty of Medicine, Alexandria University. SUPERVISORS Prof. Dr. Mohammad El-Hifnawy Professor of Ophthalmology Faculty
Technicians & Nurses Program
ASCRS ASOA Symposium & Congress Technicians & Nurses Program April 17-21, 2015 San Diego, California Update on Post-Refractive Surgery IOL Calculations ASCRS Technicians and Nurses Program April 18 th,
Incision along Steep Axis
Toric IOL An option or a must? ~ 15% cataract surgical patients >1.5 D Options: spectacles, CLs, Incision along steep axis, LRI, AK, toric IOL, Excimer Laser or a combination Walter J. Stark, MD Professor
Update on Post- Refractive Surgery IOL Calculations
Update on Post- Refractive Surgery IOL Calculations Hawaiian Eye 2014 Kauai Rhonda G Waldron MMSc, COMT, CRA, ROUB, RDMS Diagnostic Echographer, Senior Associate in Ophthalmology Emory Eye Center Atlanta,GA
Cataract Testing. What a Patient undergoes prior to surgery
Cataract Testing What a Patient undergoes prior to surgery FINANCIAL DISCLOSURE I have no financial interest or relationships to disclose What do most Technicians find to be the most mundane yet very important
Supplement to October 2014. Master Your Toric Planning and Improve Refractive Outcomes With the LENSTAR LS 900. Sponsored by
Supplement to October 2014 Master Your Toric Planning and Improve Refractive Outcomes With the LENSTAR LS 900 Sponsored by Contents Lenstar and the T-Cone Toric Platform... xx Offering sophisticated planning
When To Laser, When To Implant, When To Do Both
When To Laser, When To Implant, When To Do Both Scott MacRae, MD Professor of Ophthalmology Professor of Visual Sciences StrongVision Refractive Surgery Center University of Rochester Eye Institute Refractive
Cataract Surgery after Myopic Refractive Procedures. Ray Guard Eye Center Huang Wei-Jen, MD
Cataract Surgery after Myopic Refractive Procedures Ray Guard Eye Center Huang Wei-Jen, MD Financial Disclosures : * No financial interest on products mentioned Cataract Surgery after Myopic Refractive
Curtin G. Kelley, M.D. Director of Vision Correction Surgery Arena Eye Surgeons Associate Clinical Professor of Ophthalmology The Ohio State
Curtin G. Kelley, M.D. Director of Vision Correction Surgery Arena Eye Surgeons Associate Clinical Professor of Ophthalmology The Ohio State University Columbus, Ohio Refractive Errors Myopia (nearsightedness)
Cataract Surgery in Small Eyes Richard S. Hoffman, MD Clinical Associate Professor of Ophthalmology Oregon Health & Science University No Financial Interests Anatomic Classification Short AC depth with
What is the main target for all phaco surgeons?
CORRECTION C O OF ASTIGMATISM DURING CATARACT SURGERY Abdallah dllh K. Hassouna, M.D. Sherein S. Wahba, M.D. Ain Shams University 2009 Main target What is the main target for all phaco surgeons? Main Target
LASIK. Complications. Customized Ablations. Photorefractive Keratectomy. Femtosecond Keratome for LASIK. Cornea Resculpted
Refractive Surgery: Which Procedure for Which Patient? David R. Hardten, M.D. Minneapolis, Minnesota Have done research, consulting, or speaking for: Alcon, Allergan, AMO, Bausch & Lomb, Inspire, Medtronic,
Insert to. January 2011. Comfort and confidence for all IOL calculations
Insert to January 2011 Comfort and confidence for all IOL calculations Advanced Optical Biometry and Keratometry with LENSTAR LS 900 CONTENTS Lenstar and Ray-Tracing Calculations...3 By Jaime Aramberri,
OCT-based IOL power calculation for eyes with previous myopic and hyperopic laser vision correction
American Academy of Ophthalmology Annual Meeting Orlando, Florida, 21-25 October 2011 OCT-based IOL power calculation for eyes with previous myopic and hyperopic laser vision correction Weeks Professor
IOL Power Calculations for Postrefractive Surgery Eyes
eyetube.net The Creator s Forum: IOL Power Calculations for Postrefractive Surgery Eyes Olsen Formula By Thomas Olsen, MD, PhD The calculation of IOL power in an eye that has undergone corneal refractive
Challenging Refractive Surgery Cases. Vance Thompson, MD, FACS Refractive and Cataract Surgery Vance Thompson Vision Sioux Falls, South Dakota
Challenging Refractive Surgery Cases Vance Thompson, MD, FACS Refractive and Cataract Surgery Vance Thompson Vision Sioux Falls, South Dakota Financial Disclosures Research/consulting: Alcon AMO B & L
Corneal Power Measurements Using Scheimpflug Imaging in Eyes With Prior Corneal Refractive Surgery
Corneal Power Measurements Using Scheimpflug Imaging in Eyes With Prior Corneal Refractive Surgery Jack T. Holladay, MD, MSEE, FACS; Warren E. Hill, MD, FACS; Andreas Steinmueller, MSc ABSTRACT PURPOSE:
5/24/2013 ESOIRS 2013. Moderator: Alaa Ghaith, MD. Faculty: Ahmed El Masri, MD Mohamed Shafik, MD Mohamed El Kateb, MD
ESOIRS 2013 Moderator: Alaa Ghaith, MD Faculty: Ahmed El Masri, MD Mohamed Shafik, MD Mohamed El Kateb, MD 1 A systematic approach to the management of Keratoconus through the presentation of different
AcrySof IQ Toric IOL (SN6ATT) Surgeon Keys for Success & Acknowledgement
AcrySof IQ Toric IOL (SN6ATT) Surgeon Keys for Success & Acknowledgement Alcon Laboratories, Inc is pleased to announce the availability of the AcrySof IQ Toric intraocular lens, and delighted that you
THE BEST OF BOTH WORLDS Dual-Scheimpflug and Placido Reaching a new level in refractive screening
THE BEST OF BOTH WORLDS Dual-Scheimpflug and Placido Reaching a new level in refractive screening GALILEI G4 Clinical Applications Corneal Implant Planning The comes with a licensable corneal inlay software
Premium IOL Implantation Calculations in Post-LASIK Cataract Eyes Using ASCRS IOL Calculator
Premium IOL Implantation Calculations in Post-LASIK Cataract Eyes Using ASCRS IOL Calculator Sahiba K Chailertborisuth, Saneha K. C. Borisuth, Navaneet S.C. Borisuth, MD, PhD Virdi Eye Clinic & Laser Vision
No-history method of intraocular lens power calculation for cataract surgery after myopic laser in situ keratomileusis
J CATARACT REFRACT SURG - VOL 33, JANUARY 2007 No-history method of intraocular lens power calculation for cataract surgery after myopic laser in situ keratomileusis H. John Shammas, MD, Maya C. Shammas,
IOL Calculation After LASIK. Chapter (3)
the cornea (P) may be considered as the sum of the power of the anterior (Pa) and posterior (Pp) corneal surfaces, as shown in the formula: P = Pa + Pp = (n2 n1)/r1 + (n3 n2)/r2, where n1 is the refractive
Keratoconus Detection Using Corneal Topography
Keratoconus Detection Using Corneal Topography Jack T. Holladay, MD, MSEE, FACS ABSTRACT PURPOSE: To review the topographic patterns associated with keratoconus suspects and provide criteria for keratoconus
ALL-IN-ONE Optical Biometry, Dual Scheimpflug Tomography and Placido Topography
ALL-IN-ONE Optical Biometry, Dual Scheimpflug Tomography and Placido Topography GALILEI G6 Clinical Applications High confidence premium IOL selection The GALILEI G6 offers a link to the ray-tracing software
Course # Intra Corneal Ring Segments Contact Lens Management of Irregular Astigmatism
Course # 772 Intra Corneal Ring Segments Contact Lens Management of Irregular Astigmatism Intra Corneal Ring Segments Contact Lens Management of Irregular Astigmatism Financial Disclosure I do not own
Comparison of Corneal Power and Intraocular Lens Power Calculation Methods after LASIK for Myopia. Abstract
Comparison of Corneal Power and Intraocular Lens Power Calculation Methods after LASIK for Myopia Seyed Mohammad Reza Taheri, MD 1 Azita Kheiltash, MD, MPH 2 Hassan Hashemi, MD 1,3 Abstract Purpose: To
Simple regression formula for intraocular lens power adjustment in eyes requiring cataract surgery after excimer laser photoablation
J CATARACT REFRACT SURG - VOL 32, MARCH 26 Simple regression formula for intraocular lens power adjustment in eyes requiring cataract surgery after excimer laser photoablation Samuel Masket, MD, Seth Everett
How To Treat Eye Sight Problems With Eye Care
Dealing With The Refractive Surprise Richard S. Hoffman, MD Clinical Associate Professor of Ophthalmology Casey Eye Institute Oregon Health and Science University No Financial Interest Why The Surprise?
INTRODUCTION. Trans Am Ophthalmol Soc 2006;104:402-413
ORBSCAN II ASSISTED INTRAOCULAR LENS POWER CALCULATION FOR CATARACT SURGERY FOLLOWING MYOPIC LASER IN SITU KERATOMILEUSIS (AN AMERICAN OPHTHALMOLOGICAL SOCIETY THESIS) BY Henry Gelender MD ABSTRACT Purpose:
Insert to October 2013 THE COMPLETE PICTURE. Experiences with the ALADDIN system. Sponsored by Topcon
Insert to October 2013 THE COMPLETE PICTURE Experiences with the ALADDIN system Sponsored by Topcon THE COMPLETE PICTURE Advantages of The Aladdin How this all-in-one optical biometer edged out the IOLMaster
Posterior Corneal Astigmatism: Is It Important? MP Weikert, MD Baylor College of Medicine October 23, 2011
: Is It Important? MP Weikert, MD Baylor College of Medicine October 23, 2011 Corneal Imaging What major challenge do we face when imaging the cornea? Measuring the curvature & refractive power of the
EUROPEAN JOURNAL OF PHARMACEUTICAL AND MEDICAL RESEARCH www.ejpmr.com
ejpmr, 2015,2(3), 436-440 EUROPEAN JOURNAL OF PHARMACEUTICAL AND MEDICAL RESEARCH www.ejpmr.com Tumram et al. SJIF Impact Factor 2.026 Research Article ISSN 3294-3211 EJPMR CLINICAL OUTCOME OF TORIC IOL
The Pentacam: Precision, Confidence, Results, and Accurate Ks!
The Pentacam: Precision, Confidence, Results, and Accurate Ks! Produced under an unrestricted educational grant from Oculus, Inc. This monograph is based on an informational symposium presented at the
VA high quality, complications low with phakic IOL
Page 1 of 5 VA high quality, complications low with phakic IOL Use in keratoconus will continue, one surgeon predicts; another ponders long-term safety Nov 1, 2007 By:Nancy Groves Ophthalmology Times Several
Surgical Advances in Keratoconus. Keratoconus. Innovations in Ophthalmology. New Surgical Advances. Diagnosis of Keratoconus. Scheimpflug imaging
Surgical Advances in Keratoconus Keratoconus Ectatic disorder 1 in 1,000 individuals Starts in adolescence & early adulthood Uncertain cause 20% require corneal transplant Innovations in Ophthalmology
KERATOCONUS IS A BILATERAL, ASYMMETRIC, CHRONIC,
Comparison of and Intacs for Keratoconus and Post-LASIK Ectasia MUNISH SHARMA, MD, AND BRIAN S. BOXER WACHLER, MD PURPOSE: To evaluate the efficacy of single-segment Intacs and compare with double-segment
Ectasia after laser in-situ keratomileusis (LASIK)
Ectasia after laser in-situ keratomileusis (LASIK) 長 庚 紀 念 醫 院 眼 科 蕭 靜 熹 Post-LASIK ectasia A rare complication of LASIK Manhattan jury awarded a former investment banker a record $7.25 million for post-lasik
How do we use the Galilei for cataract and refractive surgery?
How do we use the Galilei for cataract and refractive surgery? Douglas D. Koch, MD Mariko Shirayama, MD* Li Wang, MD, PhD* Mitchell P. Weikert, MD Cullen Eye Institute Baylor College of Medicine Houston,
REFRACTIVE SURGERY OVERVIEW 2007 Lecture notes Professor Charles McGhee PhD FRCOphth
REFRACTIVE SURGERY OVERVIEW 2007 Lecture notes Professor Charles McGhee PhD FRCOphth Importance of refractive surgery Refractive surgery increasingly popular Essentially healthy eyes with normal visual
Making the Most of High-tech Biometry
4/2/2014 Making the Most of High-tech Biometry Today s advanced technology calls for a well-informed user in order to optimize results. Here s help. By Christopher Kent Senior Editor As cataract surgery
COMPARISON OF INTRAOCULAR LENS POWER CALCULATION METHODS IN EYES THAT HAVE UNDERGONE LASER-ASSISTED IN-SITU KERATOMILEUSIS
COMPARISON OF INTRAOCULAR LENS POWER CALCULATION METHODS IN EYES THAT HAVE UNDERGONE LASER-ASSISTED IN-SITU KERATOMILEUSIS BY Li Wang MD PhD, Marc A. Booth MD, AND Douglas D. Koch MD* ABSTRACT Purpose:
articles Intraocular lens power calculation after corneal refractive surgery: Double-K method Jaime Aramberri, MD
articles Intraocular lens power calculation after corneal refractive surgery: Double-K method Jaime Aramberri, MD Purpose: To determine the accuracy of a method of calculating intraocular lens (IOL) power
Managing Astigmatism in your Cataract Practice
Managing Astigmatism in your Cataract Practice KAREN S. BACHMAN, COMT, COE, OCS THE EYE INSTITUTE OF UTAH Disclaimer Ms. Bachman: Member of Alcon Speakers Alliance Mr. Larson: Employee of Corcoran Consulting
Laser Refractive Cataract Surgery with the LenSx Laser
Laser Refractive Cataract Surgery with the LenSx Laser a Novartis company LenSx Laser 2 3 An Evolving Definition of Cataract Average Age of US Cataract Patient is Projected to Decline Today: earlier diagnosis
Premium Lenses in Problematic Patients
Premium Lenses in Problematic Patients How to be successful with presbyopic lenses in eyes that have already had LASIK surgery. Walter Bethke, Managing Editor If implanting a monofocal intraocular lens
Comparison Combined LASIK Procedure for Ametropic Presbyopes and Planned Dual Interface for Post-LASIK Presbyopes Using Small Aperture Corneal Inlay
Comparison Combined LASIK Procedure for Ametropic Presbyopes and Planned Dual Interface for Post-LASIK Presbyopes Using Small Aperture Corneal Inlay Minoru Tomita, MD, PhD 1,2 1) Shinagawa LASIK, Tokyo,
Management of Astigmatism in Cataract Surgery
Management of Astigmatism in Cataract Surgery Jonathan B. Rubenstein, M Vice- Chairman and eutsch Family Professor of Ophthalmology irector of Refractive Surgery Rush University Medical Center Financial
TRUSTED LASIK SURGEONS. Eye Conditions Correctable by Refractive Surgical Procedures
Eye Conditions Correctable by Refractive Surgical Procedures How does the eye focus? Light rays are focused on to the retina (where the image is relayed to the brain) by the cornea and the lens of the
IOLMaster 500. Excellence in Biometry. Precision. Simplicity. Outcomes.
IOLMaster 500 Excellence in Biometry. Precision. Simplicity. Outcomes. 2 IOLMaster 500 The gold standard in biometry is evolving to meet today s challenges Mastery is achieved through continuous practice
Kerry D. Solomon, MD, is Director of the Carolina Eyecare Research Institute at Carolina Eyecare Physicians in Charleston, S.C.
I think the ideal diagnostic technology for all of us would be a device where we could take a measurement, make an adjustment based on the patient s history, including past surgery, and come up with an
Biometry for Refractive Lens Surgery
3 Biometry for Refractive Lens Surgery Mark Packer, I. Howard Fine, Richard S. Hoffman CORE MESSAGES 2 Achieving emmetropia in refractive lens surgery depends on accurate biometry and IOL power calculation.
Standardized Analyses of Correction of Astigmatism With the Visian Toric Phakic Implantable Collamer Lens
Standardized Analyses of Correction of Astigmatism With the Visian Toric Phakic Implantable Collamer Lens Donald R. Sanders, MD, PhD; Edwin J. Sarver, PhD ABSTRACT PURPOSE: To demonstrate the methodology
IOL Power Calculations for Postrefractive Surgery Eyes
eyetube.net The Creator s Forum: IOL Power Calculations for Postrefractive Surgery Eyes The minds behind today s commonly used formulas provide overviews and pearls for use. By Wolfgang Haigis, Ms, PhD;
THE GUIDE TO REFRACTIVE LENS EXCHANGE SEE CLEARLY.
THE GUIDE TO REFRACTIVE LENS EXCHANGE SEE CLEARLY. EVERYBODY WANTS TO SEE CLEARLY Many of us take our sight for granted, whether it s forgetting how often we rely on it to guide us through our day-to-day
ICRS implantation with the Femto LDV laser in stabilized KC patients: 6 months results
ICRS implantation with the Femto LDV laser in stabilized KC patients: 6 months results Jérôme C. VRYGHEM, M.D. Brussels Eye Doctors Brussels, Belgium No financial interest! A lot of KC patients show interest
What are your options for correcting astigmatism?
What are your options for correcting astigmatism? If you depend upon eyeglasses, you may have experienced the inconvenience of not being able to find your glasses when you really need them. Eyeglasses
Supplement to January 2013. Sponsored by STAAR Surgical. New Outcomes:
Supplement to January 2013 Sponsored by STAAR Surgical New Outcomes: Visian ICL CentraFLOW Technology Highlights from the Ninth Annual Visian ICL Experts Symposium, September 2012 Visian ICL With KS-Aquaport
Estimation of true corneal power after keratorefractive surgery in eyes requiring cataract surgery: BESSt formula
J CATARACT REFRACT SURG - VOL 32, DECEMBER 2006 ARTICLES Estimation of true corneal power after keratorefractive surgery in eyes requiring cataract surgery: BESSt formula Edmondo Borasio, MedCBQ Ophth,
Your one stop vision centre Our ophthalmic centre offers comprehensive eye management, which includes medical,
sight see OLYMPIA EYE & LASER CENTRE Your one stop vision centre Our ophthalmic centre offers comprehensive eye management, which includes medical, At the Olympia Eye & Laser Centre, our vision is to improve
Refractive Surgery. Evolution of Refractive Error Correction
Refractive Surgery Techniques that correct for refractive error in the eye have undergone dramatic evolution. The cornea is the easiest place to place a correction, so most techniques have focused on modifying
Overview. Addressing Astigmatism with Toric IOL Implantation: Pre-Operative and Operative Considerations. Where are we now? How have we progressed?
Addressing Astigmatism with Toric IOL Implantation: Pre-Operative and Operative Considerations Jason Wang, M.D. Spring Symposium 2012 OMNI Eye Specialists / Spivack Vision Center March 3, 2012 Overview
LASIK and Refractive Surgery. Laser and Lens Vision Correction Options
LASIK and Refractive Surgery Laser and Lens Vision Correction Options For over 30 years, The Eye Institute of Utah has been giving people vision for life... Dr. Andrew Lyle, vision pioneer and founder
My Favorite Practice Altering Therapeutic Cases. Retinal Specialist Results. Case #1 History. Referred to LHEA (my office)
My Favorite Practice Altering Therapeutic Cases Case #1 A complicated case made easy Case #1 History Patient referred from Dallas by brother in law Saw OD first with report of blurry vision OD occurring
efocus Success strategies for patient education in primary eye care practice
Issue 044 March 2012 efocus Excellence in Co-Managed Care P A C I F I C V I S I O N I N S T I T U T E Life in Focus 415.922.9500 www.pacificvision.org Success strategies for patient education in primary
Robert A. Latkany, MD, Amit R. Chokshi, MD, Mark G. Speaker, MD, PhD, Jodi Abramson, MD, Barrie D. Soloway, MD, Guopei Yu, MD, MPH
Intraocular lens calculations after refractive surgery Robert A. Latkany, MD, Amit R. Chokshi, MD, Mark G. Speaker, MD, PhD, Jodi Abramson, MD, Barrie D. Soloway, MD, Guopei Yu, MD, MPH Purpose: To evaluate
Presbyopia modern surgical treatments. Johan Lønsmann Poulsen, Euroeyes
Presbyopia modern surgical treatments Johan Lønsmann Poulsen, Euroeyes Presbyopia the earliest treatments Reading stones Emperor Nero (37-68 AD) Presbyopia design trends c. 1400s c. 1680-1750 c. 1800 1850
Explanation of the Procedure
Informed Consent Cataract Surgery with Intraocular Lens Implant Please initial below indicating that you have read and understand each section Introduction The internal lens of the eye can become cloudy
Phacoemulsification: Considerations for Astigmatism Management Jason P. Brinton, MD and Thomas A. Oetting, MS, MD June 10, 2011
Phacoemulsification: Considerations for Astigmatism Management Jason P. Brinton, MD and Thomas A. Oetting, MS, MD June 10, 2011 Introduction Patient expectations for cataract surgery have increased significantly
Richard S. Hoffman, MD. Clinical Associate Professor of Ophthalmology Oregon Health & Science University
Zeiss Mel 80 and Visumax Refractive Laser Systems Richard S. Hoffman, MD Clinical Associate Professor of Ophthalmology Oregon Health & Science University No Financial Interest ZEISS Workstation CRS-Master
IOLMaster with Software Version V 3.0
IOLMaster with Software Version V 3.0 The aim of this little paper is to provide you with a condensed summary of everything you need to know about the IOLMaster and the new software version V 3.0 and higher.
WHAT IS A CATARACT, AND HOW IS IT TREATED?
4089 TAMIAMI TRAIL NORTH SUITE A103 NAPLES, FL 34103 TELEPHONE (239) 262-2020 FAX (239) 435-1084 DOES THE PATIENT NEED OR WANT A TRANSLATOR, INTERPRETOR OR READER? YES NO TO THE PATIENT: You have the right,
Overview of Refractive Surgery
Overview of Refractive Surgery Michael N. Wiggins, MD Assistant Professor, College of Health Related Professions and College of Medicine, Department of Ophthalmology Jones Eye Institute University of Arkansas
Minimally Invasive Surgery: Femtosecond Lasers and Other Innovative Microsurgical Techniques
Minimally Invasive Surgery: Femtosecond Lasers and Other Innovative Microsurgical Techniques Julio Narváez MD Associate Professor of Ophthalmology Loma Linda University Non-Refractive Applications of Femtosecond
Informed Consent for Refractive Lens Exchange (Clear Lens Extraction)
Informed Consent for Refractive Lens Exchange (Clear Lens Extraction) This form is designed to ensure that you have all the information you need to make a decision about whether or not you wish to undergo
Informed Consent for Refractive Lens Exchange (Clear Lens Replacement)
Mark Packer, M.D. Informed Consent for Refractive Lens Exchange (Clear Lens Replacement) This surgery involves the removal of the natural lens of my eye, even though it is not a cataract. The natural lens
Maximizing Your Cataract Surgery Outcomes in Corneal Disease
Maximizing Your Cataract Surgery Outcomes in Corneal Disease W. Barry Lee, M.D., F.A.C.S. Cornea & Refractive Surgery Eye Consultants of Atlanta Piedmont Hospital Co-Medical Director Georgia Eye Bank Atlanta,
Providing Optimal Optics For Your Astigmatic Cataract Patients. While the cornea remains relatively stable and prolate throughout life
Providing Optimal Optics For Your Astigmatic Cataract Patients David I. Geffen, OD, FAAO Why keep the crystalline lens? While the cornea remains relatively stable and prolate throughout life Unless we
Optimizing refractive outcomes
APACRS The news magazine of the Asia-Pacific Association of Cataract & Refractive Surgeons Supplement to EyeWorld Asia-Pacific Winter 2014 Asia-Pacific Surgical management of astigmatism Sponsored by Abbott
Keratorefractive Surgery for Post-Cataract Refractive Surprise. Moataz El Sawy
Keratorefractive Surgery for Post-Cataract Refractive Surprise Moataz El Sawy Departmentof Ophthalmology, Faculty of Medicine,MenoufiyaUniversity, Egypt [email protected] Abstract: Purpose: To evaluate
Staying on Target With Better Biometry
Insert to Sponsored by an educational grant from Haag-Streit USA January 2010 Staying on Target With Better Biometry A roundtable discussion about the new LENSTAR LS900, the first biometer of the entire
By Dr Waleed Al-Tuwairqi, MD Dr Omnia Sherif, MD Ophthalmology Consultants, Elite Medical & Surgical Center Riyadh -KSA.
By Dr Waleed Al-Tuwairqi, MD Dr Omnia Sherif, MD Ophthalmology Consultants, Elite Medical & Surgical Center Riyadh -KSA Rome, Italy 2013 بسم الرحمن الرحيم In the name of Allah, Most Gracious, Most Merciful
The Pentacam: Offering a Clearer View
Supplement to Sponsored by an educational grant from Oculus, Inc. February 2008 The Pentacam: Offering a Clearer View Densitometry software for cataracts Topography for premium-channel cataract surgery
Total Corneal Power Estimation: Ray Tracing Method versus Gaussian Optics Formula PATIENTS AND METHODS
Cornea Total Corneal Power Estimation: Ray Tracing Method versus Gaussian Optics Formula Li Wang, 1 Ashraf M. Mahmoud, 2 Betty Lise Anderson, 3 Douglas D. Koch, 1 and Cynthia J. Roberts 2 PURPOSE. To evaluate
Techniques for Enhancing Cataract Surgery Patients with Residual Refractive Error. Director of Cornea Center For Excellence In Eye Care Miami, FL
Techniques for Enhancing Cataract Surgery Patients with Residual Refractive Error William Trattler, MD Director of Cornea Center For Excellence In Eye Care Miami, FL 1 Financial Disclosures Consulting
The effect of corneal wavefront aberrations on corneal pseudo-accommodation
The effect of corneal wavefront aberrations on corneal pseudo-accommodation Li Wang, MD, PhD Elizabeth Yeu, MD, Douglas D. Koch, MD Cullen Eye Institute Baylor College of Medicine, Houston, TX Background
Refractive Surgery. Common Refractive Errors
Refractive Surgery Over the last 25 years developments in medical technology and Refractive Surgery allow almost all need for glasses and contact lenses to be eliminated. Currently there are a number of
Intraocular lens power calculation after corneal refractive surgery Sachin D. Kalyani, Alisa Kim and John G. Ladas
Intraocular lens power calculation after corneal refractive surgery Sachin D. Kalyani, Alisa Kim and John G. Ladas Department of Ophthalmology, Wilmer Ophthalmologic Institute, Johns Hopkins School of
LASIK & Refractive Surgery
LASIK & Refractive Surgery LASIK PRK ICL RLE Monovision + + + For over 30 years, The Eye Institute of Utah has been giving people vision for life... The Eye Institute of Utah was the first medical facility
Information For Consent For Cataract Surgery
Information For Consent For Cataract Surgery Your Ophthalmologist has diagnosed you with a visually significant cataract. The following handout will explain your condition and give you the information
CustomVue Treatments for Monovision in Presbyopic Patients with Low to Moderate Myopia and Myopic Astigmatism
CustomVue Treatments for Monovision in Presbyopic Patients with Low to Moderate and Myopic Introduction Pre-Operative Examination Surgical Technique 1 2 IMPORTANT INFORMATION CustomVue Monovision treatments
OCT-guided Femtosecond Laser for LASIK and Presbyopia Treatment
Shinagawa LASIK Center OCT-guided Femtosecond Laser for LASIK and Presbyopia Treatment Minoru Tomita, MD, Ph.D 1) Executive Medical Director at Shinagawa LASIK Center, Tokyo, Japan 2) Clinical Professor
Pseudo-accommodative Cornea (PAC) for the Correction of Presbyopia
Pseudo-accommodative Cornea (PAC) for the Correction of Presbyopia Alaa El Danasoury, FRCS Magrabi Hospitals & Centers Surgical options for the Correction of Presbyopia Monovision Reversal of Presbyopia:
VISION PATTERN. What Can you Expect from the ReSTOR procedure?
RESTOR Presbyopia is the normal aging process that everyone experiences over the age of 40 which affects near vision. This usually results in the need for reading glasses or bifocals. The crystalline lens