advertisement

Abstract #127931 Published in IGR 25-3

Comparing the utility of retinal nerve fiber layer and ganglion cell inner plexiform layer OCT changes to detect glaucoma progression

OBJECTIVE: Measure and compare the rates of circumpapillary retinal nerve fiber layer (cpRNFL) and macular ganglion cell-inner plexiform layer (mGCIPL) thinning in glaucomatous eyes with and without visual field (VF) progression, across a broad range of disease severity, in a large clinical population. DESIGN: Retrospective, longitudinal study SUBJECTS: 2,464 eyes (1,605 patients) with longitudinal testing (≥ 5 reliable cpRNFL, mGCIPL, and VF measurements). All cpRNFL and mGCIPL measurements were within 1 year of a VF test. METHODS: We used linear regression to measure rates of cpRNFL and mGCIPL thinning in suspect, mild, moderate, and advanced glaucoma (severity defined by Hodapp-Parrish-Anderson criteria). We compared thinning rates between eyes with and without VF progression (based on trend- and/or event-based criteria). Then, we used logistic mixed-effects models to estimate the impact of cpRNFL and mGCIPL thinning rates on the probability of VF progression. We used general linear hypothesis testing to assess the effect of cpRNFL and mGCIPL thinning rates in each stage of severity. MAIN OUTCOME MEASURES: Rates of cpRNFL and mGCIPL thinning (μm/year) stratified by disease severity RESULTS: cpRNFL and mGCIPL thinning rates were significantly faster in progressing eyes (-1.02 and -1.04 μm/year, respectively) than in non-progressing eyes (-0.41 and -0.41 μm/year, respectively). Differences between progressors and non-progressors diminished with worsening disease severity. The effect of cpRNFL and mGCIPL thinning on the probability of VF progression was similar overall (2.4% vs 2.1% increased probability per 1 μm/year faster rate of thinning) but differed depending on the glaucoma severity. The effect of cpRNFL thinning was greatest in glaucoma suspects but was not statistically significant in advanced glaucoma. In contrast, the effect of mGCIPL thinning was smallest in suspects, increased with worsening disease severity, and was still statistically significant in advanced disease. CONCLUSION: cpRNFL and mGCIPL changes serve complementary roles in monitoring glaucoma progression depending on the stage of disease severity. cpRNFL is more strongly associated with VF progression than mGCIPL in early glaucoma. mGCIPL is more strongly associated with progression than cpRNFL in later stages of glaucoma.

Department of Ophthalmology and Visual Sciences, University of Maryland School of Medicine, Baltimore, MD, USA.

Classification:

15 Miscellaneous

• ← Previous
• Next →