Predictors of glaucomatous progression in individuals with small and large optic discs.

To identify factors associated with glaucomatous progression in individuals with small and large optic discs. Retrospective review. 4,505 individuals with glaucoma at UCLA; 233 (59.7%) with small discs, 157 (40.3%) with large discs. Small and large disc sizes were defined by optical coherence tomography (OCT) or Heidelberg Retinal Tomography (HRT) disc area ≤5% (≤ 1.3 mm VF deterioration with mean deviation (MD), pointwise linear regression (PLR), and glaucoma rate index (GRI); large versus small disc. In individuals with small discs, Asian versus Non-Hispanic White ethnicity was associated with increased progression (adjusted odds ratio [aOR] = 4.05, 95% confidence interval [CI] = 1.12,14.59 for GRI). Higher intraocular pressure (IOP) range and peak were associated with increased progression in individuals with both small discs (aOR = 1.12, CI = 1.00, 1.27 and aOR = 1.05, CI = 1.00-1.10 per 1 mmHg for range and peak with GRI) and large discs (aOR = 1.35, CI = 1.12,1.66 and aOR = 1.11, CI = 1.03,1.20 per 1 mmHg for range and peak with GRI). Multivariable predictors of having large versus small discs included vasospastic phenotype (aOR = 2.58, CI = 1.35,5.19) and Black (aOR = 20.46, CI = 8.33,61.84), Hispanic/Latino (aOR = 9.65, CI = 4.14,25.39), Asian (aOR = 4.87, CI = 2.96,8.1), and Other (aOR = 2.79, CI = 1.69,4.63) versus Non-Hispanic White ethnicity. Increased odds of glaucomatous progression were associated with Asian versus Non-Hispanic White ethnicity in glaucoma patients with small optic discs, as well as with increased IOP range and peak in those with small and large discs. Individuals with a vasospastic phenotype and those from racial and ethnic minority backgrounds had increased odds of having large versus small optic discs. Further characterization of discernible phenotypes would improve disease prognostication and help individualize glaucoma treatment.

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