Optic Nerve Imaging. Management of Glaucoma
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1 Optic Nerve Imaging in the Diagnosis and Management of Glaucoma Scott D. Smith, MD, MPH Associate Professor of Clinical Ophthalmology Director, Glaucoma Service Columbia University, New York, NY Glaucoma Diagnosis Involves numerous diagnostic modalities IOP measurement Optic disk examination Visual field testing Inter-individual variability in optic disk makes early diagnosis difficult 1
2 Glaucoma Progression Detection of glaucoma progression has numerous obstacles Lack of standardized definition of progression Test-retest variability (visual fields) Subjective assessment of serial disk photos Imaging and Glaucoma Technological advances in ophthalmic imaging offer potential improvement in identification of structural abnormalities caused by glaucoma Optic nerve head Retinal nerve fiber layer 2
3 Imaging and Glaucoma Multiple instruments each based on different imaging principles Confocal scanning laser ophthalmoscopy Heidelberg Retinal Tomograph Scanning laser polarimetry GDx Optical coherence tomography Reproducibility To be useful, any new imaging instrument must be reproducible Improved in some cases by averaging of multiple scans Each has been shown to have good reproducibility 3
4 HRT Diode laser (670 nm) 15 x 15 degree scan (384 x 384 point grid) Resolution: 300 µm axial 10 µm transverse 3-D image of ONH Series of 16 to 64 2-dimansional scans HRT Operator defined optic disk margin Contour line 4
5 HRT Contour line defines the reference plane HRT HRT measurements are strongly related to the reference plane location Greatest source of measurement variability 5
6 HRT III Improved software Single image analysis does not depend upon user-identified optic disk margin Improved progression analysis 6
7 HRT Indirect measure of RNFL thickness Confounding by non-glaucomatous variation in optic nerve head anatomy Poor performance in distinguishing glaucoma from normal in population-based studies Sensitivity 65% Specificity 83% Saito et al. Ophthalmology 2009;116:
8 GDx GDx measures thickness of retinal NFL Scanning laser polarimetry Measures birefringence of RNFL Birefringence varies with RNFL thickness 8
9 GDx Uses diode laser light source (780 nm) 20 x 20 degree measurement area Data displayed as 256 x 256 pixel grid GDx Artifact in NFL thickness measurement introduced by birefringence of other ocular structures Cornea Older generation of instrument adjusted for expected corneal birefringence 9
10 GDx VCC Variable Corneal Compensation (VCC) Allows measurement of individual corneal birefringence Compensates for individual differences Improves reliability and detection of early glaucoma 10
11 11
12 Optical Coherence Tomography OCT Optical equivalent of B-scan ultrasonography Short wavelength yields high resolution 12
13 3.4 mm Diameter 13
14 Recent Developments in OCT OCT is an evolving technology Spectral Domain OCT Uses spectroscopy rather than time delay to detect depth information Dramatically reduces scan time Allows significant increase in resolution 14
15 Wollstein G, et al. Ophthalmology 2005; 112: Cirrus OCT (Zeiss) 15
16 Spectralis OCT (Heidelberg) SD-OCT vs. Stratus OCT Fewer artifacts Ho et al., Ophthalmology 2009; 116: Better reproducibility Cirrus: Leung C, et al. Ophthalmology 2009; 116: Spectralis: Arthur SN, Smith SD, et al. Ophthalmology (in press). 16
17 SD-OCT vs. Stratus OCT Better sensitivity/specificity in detecting perimetric glaucoma Chang RT, et al. Ophthalmology 2009; e-pub ahead of print. Similar sensitivity/specificity in detecting perimetric glaucoma Jeoung JW, Park KH. IOVS; 2009: e-pub ahead of print. SD-OCT vs. Stratus OCT Principal advantages are improved reproducibility Easier to detect progression Ability to measure RNFL thickness in entire peripapillary p p retina High scan speed Better progression software still needed on all SD-OCT devices 17
18 How can new imaging technologies influence clinical practice? Problems in Early Detection IOP Diurnal variation Corneal thickness Variable sensitivity to IOP-related damage Inter-individual variability of optic disks Physiologic vs. pathological cupping Disk size 18
19 Problems in Early Detection Visual Fields High degree of variability, even in reliable patients Many patients are not so reliable Problems in Early Detection Suspicious vs. definitive findings 19
20 Imaging and Glaucoma Provides another parameter to increase or decrease suspicion of glaucoma (or glaucoma progression) Imaging and Glaucoma Don t overreactreact Imaging abnormality in isolation is not enough to diagnose glaucoma Look for image quality and artifact before jumping to conclusions 20
21 Imaging and Glaucoma Useful in clinical practice in conjunction with clinical exam and visual fields Cannot interpret results of imaging in isolation Imaging and Glaucoma Each instrument has its advantages and disadvantages No instrument proven to be clinically superior to others Initial studies suggest superior reproducibility and diagnostic performance of SD-OCT over Stratus- OCT 21
22 Evolving Technology HRT and GDx are nearing maturity OCT has potential for significant improvement Scan speed Resolution Evolving Technology Improved software for detection of optic nerve abnormality and glaucoma progression needed to take advantage of higher resolution of SD-OCT Numerous manufacturers in the market should help speed introduction of these improvements into clinical practice 22
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