Corneal Topography. Optometry 260A
|
|
|
- Dwain Stevens
- 7 years ago
- Views:
Transcription
1 Corneal Topography Optometry 260A
2 What is corneal topography? Measurement of corneal shape AKA videokeratography (VK)
3 Why do corneal topography? Keratoconus diagnosis and monitoring Refractive surgery Pre-surgical keratoconus screening Troubleshooting unsatisfactory outcomes Contact lens fitting Lens selection Orthokeratology Monitoring corneal warpage
4 Components of a CT system Apparatus for illuminating cornea Placido cone Scanning slit Video camera for image capture Computer for data analysis
5 Placido-based systems Placido disk consists of concentric rings, reflected off of the cornea
6 Placido-based systems Target may be large or small
7 Placido-based systems Like multiple keratometry mires Ring may be center of white or dark/light and light/dark borders Curvature calculated from distance between rings for each radial meridian
8 Scanning section system Orbscan (B & L) Reconstructs height from video of slit scan of cornea Combines with Placido data for curvature
9 Scanning section system
10 Sources of error Tear debris or dry spots Lashes or nose blocking mires Focus error Fixation error Distortion
11 Types of displays Color maps Curvature (axial and tangential) Height Refractive power Raw image/rings Simulated K s Meridional sections Numeric Irregularity indices Contact lens fluorescein pattern simulations
12 Other features Pupil outline Grid (rectangular or polar) Power displayed for cursor location Eccentricity
13 Reading the basic map Curvature maps are most common Axial Tangential Curvatures are calculated from data Each instrument has its own algorithm Meridional curvature (from center radially) Radius is converted to diopters using n=1.3375, not the index of cornea
14 Reading the basic map Colors represent curvatures Warmer colors (red) = higher curvature Cooler colors (blue) = lower curvature
15 Features of corneas Toricity WTR ATR Oblique Asphericity Apex location Local anomalies
16 Toricity - WTR
17 Toricity - ATR
18 Toricity - Oblique
19 Asphericity
20 Asphericity
21 Asphericity
22 Apex location Apex location skews map
23 Tight eyelids Local anomalies
24 Color scales - absolute
25 Color scales - relative
26 Color scales Absolute Good for comparing maps Color intervals may vary May hide detail Relative (normalized) More detail Better range of color for a given map Color intervals equal May exaggerate detail
27 Color scales
28 Color scales K = 2.62 D K = 0.75 D
29 Types of color maps Curvature Axial Tangential Height Absolute, or Relative to a reference shape, e.g., sphere Refractive power
30 Curvature maps Axial map Less noisy, so smoother Better for overall view Good for monitoring change Tangential map Noisier, so more local detail More accurate for curvature More accurate for location
31 Curvature maps - axial
32 Curvature maps - tangential
33 Curvature maps
34 Height map - best fit sphere Difference from best fit sphere or ellipsoid Shows toricity
35 Refractive power map Based on Snell s law and ray tracing Parallel light rays striking the corneal surface from infinity are refracted. Ray C has the greatest refractive power since it crosses the optical axis at the shortest focal distance, c. Rays B and A have longer focal lengths, respectively, (b and a), and therefore have the least refractive power.
36 Refractive power map
37 Color maps - overview
38 Clinical applications Keratoconus Other corneal conditions, detecting irregularity, explaining reduced VA Refractive surgery Contact lenses
39 Keratoconus Diagnosis of early cases Describing size, location, curvature of cone Monitoring change
40 Keratoconus Clinical signs Methods of detecting with topography Tangential power (peak > 49 D) Difference between 2 eyes at apex Progression Statistical indices
41 Keratoconus
42 Keratoconus Tangential map best for peak power, location
43 Keratoconus Axial map underestimates peak power, overestimates distance to apex
44 Keratoconus Condition CIM (Corneal Irregularity Measurement) SF (Shape Factor) TKM (Mean Toric Keratometry)
45 Keratoconus
46 Refractive surgery Pre-surgical keratoconus screening Troubleshooting unsatisfactory outcomes
47 Refractive surgery Tangential map best for power, location
48 Refractive surgery
49 Refractive surgery
50 Contact lenses Lens selection Orthokeratology Monitoring corneal warpage (distortion)
51 Lens selection
52 Lens selection
53 Orthokeratology
54 Orthokeratology
55 Corneal distortion Differentiating keratoconus from CL distortion CL distortion follows lens decentration CL distortion usually has smile pattern
56 Corneal distortion Despite red cone-like topography pattern, the corneal curvature is only 45 diopters at the highest point. Although CIM is quite abnormal, both Shape Factor and Mean Toric K s are in the normal range, eliminating the diagnosis of keratoconus.
57 Corneal distortion
CORNEAL TOPOGRAPHY. Refractive power of the eye
CORNEAL TOPOGRAPHY Anne Faucher, M.D., FRCS University of Toronto Refractive power of the eye Eye has 3 refractive elements: 1. Cornea 2. Lens 3. Axial length Cornea (air/tear film interface) provides
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
7/24/2014 ORBSCAN. Dr. HARITHA
ORBSCAN Dr. HARITHA Cornea is the most powerful refractive element, contributing 43D of total 60D power of eye. Anterior surface elliptical, HD-11.5mm VD-10.6mm. Posterior surface- circular,avg D- 11.5mm
C) D) As object AB is moved from its present position toward the left, the size of the image produced A) decreases B) increases C) remains the same
1. For a plane mirror, compared to the object distance, the image distance is always A) less B) greater C) the same 2. Which graph best represents the relationship between image distance (di) and object
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
Irregular astigmatism:
Irregular astigmatism: definition, classification, topographic and clinical presentation Ming X. Wang, MD, PhD Clinical Associate Professor of Ophthalmology of University of Tennessee Director, Wang Vision
Page: 1 of 6. Corneal Topography/Computer-Assisted Corneal Topography/ Photokeratoscopy
Section: Surgery Effective Date: July 15, 2015 Last Review Status/Date: June 2015 Page: 1 of 6 Corneal Topography/ Photokeratoscopy Description Computer-assisted topography/photokeratoscopy provides a
ABrand New Refraction Meas urement Instrument
PW ABrand New Refraction Meas urement Instrument The TOPCON KR-9000PW WAVEFRONT ANALYZER incorporates comprehensive measurement of the eye's total optical system which has not been achieved until now,
Customized corneal ablation and super vision. Customized Corneal Ablation and Super Vision
Customized Corneal Ablation and Super Vision Scott M. MacRae, MD; James Schwiegerling, PhD; Robert Snyder, MD, PhD ABSTRACT PURPOSE: To review the early development of new technologies that are becoming
Power Diameter Base curve SOFT TORIC CONTACT LENS PROF.DR.SAMIHA ABOULMAGD 1
Fitting Soft Contact Lens Prof. Dr. Samiha Aboulmagd MD Head of fophthalmology l Department Al-Azhar University 2010 1 Fitting of contact lens Power Diameter Base curve 2 PROF.DR.SAMIHA ABOULMAGD 1 Fitting
Geometric Optics Converging Lenses and Mirrors Physics Lab IV
Objective Geometric Optics Converging Lenses and Mirrors Physics Lab IV In this set of lab exercises, the basic properties geometric optics concerning converging lenses and mirrors will be explored. The
AP Physics B Ch. 23 and Ch. 24 Geometric Optics and Wave Nature of Light
AP Physics B Ch. 23 and Ch. 24 Geometric Optics and Wave Nature of Light Name: Period: Date: MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Reflection,
Procedure: Geometrical Optics. Theory Refer to your Lab Manual, pages 291 294. Equipment Needed
Theory Refer to your Lab Manual, pages 291 294. Geometrical Optics Equipment Needed Light Source Ray Table and Base Three-surface Mirror Convex Lens Ruler Optics Bench Cylindrical Lens Concave Lens Rhombus
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
2) A convex lens is known as a diverging lens and a concave lens is known as a converging lens. Answer: FALSE Diff: 1 Var: 1 Page Ref: Sec.
Physics for Scientists and Engineers, 4e (Giancoli) Chapter 33 Lenses and Optical Instruments 33.1 Conceptual Questions 1) State how to draw the three rays for finding the image position due to a thin
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
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
Customized corneal ablation can be designed. Slit Skiascopic-guided Ablation Using the Nidek Laser. Scott MacRae, MD; Masanao Fujieda
Slit Skiascopic-guided Ablation Using the Nidek Laser Scott MacRae, MD; Masanao Fujieda ABSTRACT PURPOSE: To present the approach of using a scanning slit refractometer (the ARK 10000) in conjunction with
Lecture 17. Image formation Ray tracing Calculation. Lenses Convex Concave. Mirrors Convex Concave. Optical instruments
Lecture 17. Image formation Ray tracing Calculation Lenses Convex Concave Mirrors Convex Concave Optical instruments Image formation Laws of refraction and reflection can be used to explain how lenses
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
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
Chapter 27 Optical Instruments. 27.1 The Human Eye and the Camera 27.2 Lenses in Combination and Corrective Optics 27.3 The Magnifying Glass
Chapter 27 Optical Instruments 27.1 The Human Eye and the Camera 27.2 Lenses in Combination and Corrective Optics 27.3 The Magnifying Glass Figure 27 1 Basic elements of the human eye! Light enters the
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,
Convex Mirrors. Ray Diagram for Convex Mirror
Convex Mirrors Center of curvature and focal point both located behind mirror The image for a convex mirror is always virtual and upright compared to the object A convex mirror will reflect a set of parallel
Advanced Ortho-K Technology. Proudly brought to you by. Australian Contact Lenses
Proudly brought to you by Australian Contact Lenses Advanced Ortho-K Technology Are your patients looking for crystal-clear vision without surgery? Are you looking to grow your practice and enhance patient
First results of intraoperative topometries during LASIK operations of
Patient 2: line sections 1-1 -2-3 -4-5 -6 horizontal cut vertical cut theory -7-4 -3-2 -1 1 2 3 4 radial distance [mm] First results of intraoperative topometries during LASIK operations of S.Schründer,
A Systematic Approach to Fitting Keratoconus Lenses
A Systematic Approach to Fitting Keratoconus Lenses Paul Rose, BOpt, BSc, FNZSCLP Keratoconus is a non-inflammatory ectasia of the axial cornea characterized by corneal distortion and irregular astigmatism.
Chapter 17: Light and Image Formation
Chapter 17: Light and Image Formation 1. When light enters a medium with a higher index of refraction it is A. absorbed. B. bent away from the normal. C. bent towards from the normal. D. continues in the
PRACTITIONER S FITTING GUIDE. Keratoconus Irregular Cornea Post Graft
PRACTITIONER S FITTING GUIDE Keratoconus Irregular Cornea Post Graft Four lens designs to fit all corneal shapes... One simple systematic approach to fitting Featuring Easy-to-fit using a simple systematic
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
Endoscope Optics. Chapter 8. 8.1 Introduction
Chapter 8 Endoscope Optics Endoscopes are used to observe otherwise inaccessible areas within the human body either noninvasively or minimally invasively. Endoscopes have unparalleled ability to visualize
Chapter 36 - Lenses. A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University
Chapter 36 - Lenses A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University 2007 Objectives: After completing this module, you should be able to: Determine
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
EXPERIMENT 6 OPTICS: FOCAL LENGTH OF A LENS
EXPERIMENT 6 OPTICS: FOCAL LENGTH OF A LENS The following website should be accessed before coming to class. Text reference: pp189-196 Optics Bench a) For convenience of discussion we assume that the light
1051-232 Imaging Systems Laboratory II. Laboratory 4: Basic Lens Design in OSLO April 2 & 4, 2002
05-232 Imaging Systems Laboratory II Laboratory 4: Basic Lens Design in OSLO April 2 & 4, 2002 Abstract: For designing the optics of an imaging system, one of the main types of tools used today is optical
Cassie Schroeder Refractive Surgery Coordinator Boozman-Hof Regional Eye Clinic (479) 246-1820 (479) 531-3937
Thank you for your interest in refractive surgery here at Boozman-Hof Regional Eye Clinic. Enclosed is a bio on Dr. Cole and articles about LASEK. There is also information on our financing company that
Contact Lens Correction of Regular and Irregular Astigmatism
11 Contact Lens Correction of Regular and Irregular Astigmatism Raul Martín Herranz, Guadalupe Rodríguez Zarzuelo and Victoria de Juan Herráez University of Valladolid, School of Optometry, Optometry Unit
LIGHT REFLECTION AND REFRACTION
QUESTION BANK IN SCIENCE CLASS-X (TERM-II) 10 LIGHT REFLECTION AND REFRACTION CONCEPTS To revise the laws of reflection at plane surface and the characteristics of image formed as well as the uses of reflection
That s a BIG lens!! Scleral Contact Lenses. Average Corneal diameter = 11.5mm. Size matters. Soft Contact Lens 9/24/2014. Average RGP lens = 9.
That s a BIG lens!! Scleral Contact Lenses MOA Convention 10.4.2014 Chris DeRose, OD Size matters Average RGP lens = 9.5 mm Average Corneal diameter = 11.5mm Soft Contact lens = 14.0 to 14.5mm Mini scleral
HRK-7000 / HRK-7000A Auto Ref-Keratometer
HRK-7000 / HRK-7000A Auto Ref-Keratometer To measure a human eye with ultra-precision, Huvitz s Wavefront Technology can be the right answer. Human eye is unique as a fingerprint and requires a custom
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
Contact Lens Clinical Pearls Pocket Guide
1 Contact Lens Clinical Pearls Pocket Guide 2 CONTENTS Vertex Conversion Chart 3 Spherical GP Lenses 4 Soft Toric Lenses 5 GP Back Surface and Bitoric Lenses 7 Multifocal Lenses 9 Orthokeratology 12 Keratoconus
9/16 Optics 1 /11 GEOMETRIC OPTICS
9/6 Optics / GEOMETRIC OPTICS PURPOSE: To review the basics of geometric optics and to observe the function of some simple and compound optical devices. APPARATUS: Optical bench, lenses, mirror, target
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
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
Thin Lenses Drawing Ray Diagrams
Drawing Ray Diagrams Fig. 1a Fig. 1b In this activity we explore how light refracts as it passes through a thin lens. Eyeglasses have been in use since the 13 th century. In 1610 Galileo used two lenses
BY JOHN F. DOANE, MD, FACS; PERRY S. BINDER, MD, MS; PARAG A. MAJMUDAR, MD; LOUIS E. PROBST, MD; STEPHEN G. SLADE, MD, FACS; AND WILLIAM B
What Is Your Diagnosis? Surgeons discuss their analyses of various topographies of possibly keratoconic cases and converse about their treatment recommendations. BY JOHN F. DOANE, MD, FACS; PERRY S. BINDER,
Reflection and Refraction
Equipment Reflection and Refraction Acrylic block set, plane-concave-convex universal mirror, cork board, cork board stand, pins, flashlight, protractor, ruler, mirror worksheet, rectangular block worksheet,
An Industry Leader in GP Design and Manufacturing
Proudly Serving Eye Care Professionals Since 1986 About ABBA ABBA Optical, located in Stone Mountain, Georgia, was founded in 1986 by Lee & Marie Dickerson. ABBA began business exclusively manufacturing
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
Managing Irregular Astigmatism
Non-scleral Lens Designs for Irregular Corneas Michael A. Ward, MMSc, FAAO, FCLSA Emory University Jessica Bezner Mannas, OD Koffler Vision Group Michael A Ward Potential COI Disclosures previous 12 months
Astigmatism. image. object
TORIC LENSES Astigmatism In astigmatism, different meridians of the eye have different refractive errors. This results in horizontal and vertical lines being focused different distances from the retina.
WAVELENGTH OF LIGHT - DIFFRACTION GRATING
PURPOSE In this experiment we will use the diffraction grating and the spectrometer to measure wavelengths in the mercury spectrum. THEORY A diffraction grating is essentially a series of parallel equidistant
waves rays Consider rays of light from an object being reflected by a plane mirror (the rays are diverging): mirror object
PHYS1000 Optics 1 Optics Light and its interaction with lenses and mirrors. We assume that we can ignore the wave properties of light. waves rays We represent the light as rays, and ignore diffraction.
Understanding astigmatism Spring 2003
MAS450/854 Understanding astigmatism Spring 2003 March 9th 2003 Introduction Spherical lens with no astigmatism Crossed cylindrical lenses with astigmatism Horizontal focus Vertical focus Plane of sharpest
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
Diagnosis and Imaging of Corneal Astigmatism
Diagnosis and Imaging of Corneal Astigmatism 5 Jaime Tejedor 1,2 and Antonio Guirao 3 1 Hospital Ramón y Cajal, 2 Universidad Autónoma de Madrid, 3 Universidad de Murcia, Spain 1. Introduction Accurate
LIGHT SECTION 6-REFRACTION-BENDING LIGHT From Hands on Science by Linda Poore, 2003.
LIGHT SECTION 6-REFRACTION-BENDING LIGHT From Hands on Science by Linda Poore, 2003. STANDARDS: Students know an object is seen when light traveling from an object enters our eye. Students will differentiate
1. You stand two feet away from a plane mirror. How far is it from you to your image? a. 2.0 ft c. 4.0 ft b. 3.0 ft d. 5.0 ft
Lenses and Mirrors 1. You stand two feet away from a plane mirror. How far is it from you to your image? a. 2.0 ft c. 4.0 ft b. 3.0 ft d. 5.0 ft 2. Which of the following best describes the image from
Senses 3. The optics of the eye Accommodation of the eye Ammetropias The eyeground Visual field
Senses 3 The optics of the eye Accommodation of the eye Ammetropias The eyeground Visual field Practical tasks Purkinje s images Keratoscopy Ophthalmoscopy Purkinje s flash figure Determination of the
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
LEICA TRI-ELMAR-M 28 35 50 mm f/4 ASPH. 1
LEICA TRI-ELMAR-M 28 35 5 mm f/4 ASPH. 1 This lens combines three of the focal lengths that are most popular among Leica M photographers. The appropriate bright-line frame appears in the viewfinder when
Care of the Contact Lens Patient
QUICK REFERENCE GUIDE Care of the Contact Lens Patient American Optometric Association A. DESCRIPTION AND CLASSIFICATION Contact lenses (CLs) are used primarily to neutralize refractive errors, as an alternative
Rediscover quality of life thanks to vision correction with technology from Carl Zeiss. Patient Information
Rediscover quality of life thanks to vision correction with technology from Carl Zeiss Patient Information 5 2 It was really w Vision defects: Light that goes astray For clear vision the eyes, cornea and
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
Fitting Guide. Dallas 800-366-3933 Denver 800-362-4233 Tulsa 800-685-5367
Fitting Guide Dallas 800-366-3933 Denver 800-362-4233 Tulsa 800-685-5367 Sagittal Depth Fitting the Jupiter lens design is based upon sagittal depth. Relative sagittal depth is not just the steepness of
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
ORTHOKERATOLOGY AND THE OPHTHALMIC ASSISTANT Elliott M. Rosengarten, OD
ORTHOKERATOLOGY AND THE OPHTHALMIC ASSISTANT Elliott M. Rosengarten, OD This article and accompanying quiz are worth.5 JCAHPO Group A continuing education credit. CONTINUING EDUCATION CREDITS ARE SUBJECT
OCULUS Pentacam Pentacam HR
OCULUS Pentacam Pentacam HR The Gold Standard in Anterior Segment Tomography We focus on progress Providing the best care to your patients > The eye is extremely sensitive. Loss or impairment of sight
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,
DISTANCE LEARNING COURSE. Anatomy of the Patient Exam. 2008 2012, BSM Consulting All rights reserved.
DISTANCE LEARNING COURSE Anatomy of the Patient Exam 2008 2012, BSM Consulting All rights reserved. Table of Contents OVERVIEW... 1 PRELIMINARY WORK-UP... 1 OTHER DIAGNOSTIC TESTING... 3 DIAGNOSIS... 4
Size Of the Image Nature Of the Image At Infinity At the Focus Highly Diminished, Point Real and Inverted
CHAPTER-10 LIGHT REFLECTION AND REFRACTION Light rays; are; electromagnetic in nature, and do not need material medium for Propagation Speed of light in vacuum in 3*10 8 m/s When a light ray falls on a
Basic Optics System OS-8515C
40 50 30 60 20 70 10 80 0 90 80 10 20 70 T 30 60 40 50 50 40 60 30 C 70 20 80 10 90 90 0 80 10 70 20 60 50 40 30 Instruction Manual with Experiment Guide and Teachers Notes 012-09900B Basic Optics System
DOING PHYSICS WITH MATLAB COMPUTATIONAL OPTICS RAYLEIGH-SOMMERFELD DIFFRACTION INTEGRAL OF THE FIRST KIND
DOING PHYSICS WITH MATLAB COMPUTATIONAL OPTICS RAYLEIGH-SOMMERFELD DIFFRACTION INTEGRAL OF THE FIRST KIND THE THREE-DIMENSIONAL DISTRIBUTION OF THE RADIANT FLUX DENSITY AT THE FOCUS OF A CONVERGENCE BEAM
7.2. Focusing devices: Unit 7.2. context. Lenses and curved mirrors. Lenses. The language of optics
context 7.2 Unit 7.2 ocusing devices: Lenses and curved mirrors Light rays often need to be controlled and ed to produce s in optical instruments such as microscopes, cameras and binoculars, and to change
415.922.9500 www.pacificvision.org
Issue 046 September 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 Last month, we held a dinner with the Bay Area
OCULUS PENTACAM BASIC CLASSIC HR
OCULUS PENTACAM BASIC CLASSIC We focus on progress Many Patients have Apprehensions before an Examination. > The eye is an extremely sensitive area Loss or impairment of sight always produces anxiety.
Lecture Notes for Chapter 34: Images
Lecture Notes for hapter 4: Images Disclaimer: These notes are not meant to replace the textbook. Please report any inaccuracies to the professor.. Spherical Reflecting Surfaces Bad News: This subject
Physics 1230: Light and Color
Physics 1230: Light and Color The Eye: Vision variants and Correction http://www.colorado.edu/physics/phys1230 What does 20/20 vision mean? Visual acuity is usually measured with a Snellen chart Snellen
Paragon RG-4 Fitting Reference Guide
PARAGON VISION SCIENCES Paragon RG-4 Fitting Reference Guide* & Certification Manual 2008 *This document is an abbreviated version and does not replace the FDA approved professional fitting guide. Lenses
INTRODUCTION TO RENDERING TECHNIQUES
INTRODUCTION TO RENDERING TECHNIQUES 22 Mar. 212 Yanir Kleiman What is 3D Graphics? Why 3D? Draw one frame at a time Model only once X 24 frames per second Color / texture only once 15, frames for a feature
CORNEAL MEAN CURVATURE MAPPING: APPLICATIONS IN LASER REFRACTIVE SURGERY DISSERTATION
CORNEAL MEAN CURVATURE MAPPING: APPLICATIONS IN LASER REFRACTIVE SURGERY DISSERTATION Presented in Partial Fulfillment of the Requirement for the Degree Doctor of Philosophy in the Graduate School of the
Rigid Contact Lens Fitting
Essential Contact Lens Practice Medical Ltd Rigid Contact Lens Fitting key points Key Points An ideally fitting rigid contact lens should show the following attributes: Acceptable comfort which improves
The light. Light (normally spreads out straight... ... and into all directions. Refraction of light
The light Light (normally spreads out straight...... and into all directions. Refraction of light But when a light ray passes from air into glas or water (or another transparent medium), it gets refracted
Science In Action 8 Unit C - Light and Optical Systems. 1.1 The Challenge of light
1.1 The Challenge of light 1. Pythagoras' thoughts about light were proven wrong because it was impossible to see A. the light beams B. dark objects C. in the dark D. shiny objects 2. Sir Isaac Newton
LASER VISION CORRECTION: WHAT YOU SHOULD KNOW.
LASER VISION CORRECTION: WHAT YOU SHOULD KNOW. You and your eyes Why LASIK? Our Treatment Looking Ahead What Next? FAX: +91 22 2280 9000 www.eyecareindia.com www.phirozedastoor.com You and your eyes Light
Revision problem. Chapter 18 problem 37 page 612. Suppose you point a pinhole camera at a 15m tall tree that is 75m away.
Revision problem Chapter 18 problem 37 page 612 Suppose you point a pinhole camera at a 15m tall tree that is 75m away. 1 Optical Instruments Thin lens equation Refractive power Cameras The human eye Combining
ReLEx smile Minimally invasive vision correction Information for patients
ReLEx smile Minimally invasive vision correction Information for patients Seeing is living Our eyes are our most important sensory organ. The human brain obtains over 80 % of its information via the sense
Physics 25 Exam 3 November 3, 2009
1. A long, straight wire carries a current I. If the magnetic field at a distance d from the wire has magnitude B, what would be the the magnitude of the magnetic field at a distance d/3 from the wire,
Master of Engineering in Electronic Instrumentation and Control. Submitted By. SARAH ALI HASAN Roll No: 801251019
Novel Algorithm to Differentiate Astigmatism from Keratoconus A Dissertation submitted in partial fulfilment of the requirements for the award of degree of Master of Engineering in Electronic Instrumentation
CTS Corneal Topography System. User s Guide
CTS Corneal Topography System User s Guide Introduction Congratulations on the purchase of your new CTS Corneal Topography System. The CTS software allows the visualization of the Axial, Tangential and
Life just looks better without reading glasses
Life just looks better without reading glasses TM Enjoy life without depending on reading glasses. The KAMRA inlay treatment: Restores everyday vision so you can see text messages, a computer screen and
Laser Vision Correction
How will Laser Vision Correction affect my Lifestyle? Your Guide to Laser Vision Correction The Gift of Better Vision A few things to note after your surgery. As you enjoy your new-and-improved eyesight,
Experiment 3 Lenses and Images
Experiment 3 Lenses and Images Who shall teach thee, unless it be thine own eyes? Euripides (480?-406? BC) OBJECTIVES To examine the nature and location of images formed by es. THEORY Lenses are frequently
Correction of Keratoconus with GP Lenses
Correction of Keratoconus with GP Lenses Centre for Contact Lens Research School of Optometry University of Waterloo, Canada Introduction About This Book Keratoconus can be safely and effectively corrected
Optical System Design
Optical System Design Robert E. Fischer CEO, OPTICS 1, Incorporated Biljana Tadic-Galeb Panavision Paul R. Yoder Consultant With contributions by Ranko Galeb Bernard C.Kress, Ph.D. Stephen C. McClain,
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
Analyzing LASIK Optical Data Using Zernike Functions
MATLAB Digest Analyzing LASIK Optical Data Using Zernike Functions By Paul Fricker Researchers in fields as diverse as optometry, astronomy, and photonics face a common challenge: how to accurately measure
Corneal Aberrations before and after Small-Incision Cataract Surgery METHODS. Patients
Corneal Aberrations before and after Small-Incision Cataract Surgery Antonio Guirao, 1 Jaime Tejedor, 2 and Pablo Artal 3 PURPOSE. To study the effect of small-incision cataract surgery on the optical
Vision Glossary of Terms
Vision Glossary of Terms EYE EXAMINATION PROCEDURES Eyeglass Examinations: The standard examination procedure for a patient who wants to wear eyeglasses includes at least the following: Case history; reason