Journal
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
Volume 56, Issue 11, Pages 6886-6891Publisher
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/iovs.15-16701
Keywords
OCT; retinal nerve fiber layer thickness; neuroretinal rim measurement; progression; glaucoma
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Funding
- NEI NIH HHS [R01 EY019674, R01 EY021281, R01-EY021281, R01-EY19674] Funding Source: Medline
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PURPOSE. Minimum rim width (MRW) and area (MRA) have been introduced as anatomically defensible measures of neuroretinal rim tissue observable using spectral-domain optical coherence tomography (SDOCT). They have been reported to change earlier than retinal nerve fiber layer thickness (RNFLT) in glaucoma. This study sought to determine which is better to distinguish subsequent change from variability, using the previously described longitudinal signal-to-noise ratio (LSNR). METHODS. Data from 157 eyes of 157 participants with high-risk ocular hypertension or non-end-stage glaucoma (mean deviation [MD] from -22 to +3 dB) were used. Participants were tested approximately every 6 months for at least six visits. For each eye, MRW, MRA, and RNFLT were regressed linearly against time. Longitudinal signal-to-noise ratio for each eye was defined as the rate of change over time (signal) divided by the standard deviation of residuals from this trend (noise). These were compared between parameters using a Wilcoxon signed rank test. RESULTS. The median LSNRs were -0.58y(-1) for RNFLT (bootstrapped 95% confidence interval -0.69 to -0.48y (1)); -0.44y (1) (-0.59 to -0.32y (1)) for MRW; and -0.23y (1) (-0.32 to 0.08y(-1)) for MRA. Longitudinal signal-to-noise ratios were significantly more negative for RNFLT than for MRW (P = 0.025) or for MRA (P < 0.001). CONCLUSIONS. Retinal nerve fiber layer thickness measured by SDOCT had a better LSNR than MRW or MRA. Although MRW and MRA may be more sensitive for early detection of glaucomatous damage, these data suggest that RNFLT may be preferable for monitoring change.
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