LAUSR

PURPOSE To compare optical coherence tomography angiography (OCTA) measured capillary density of the optic disc among four glaucomatous optic disc phenotypes. DESIGN Cross-sectional study. METHODS Circumpapillary capillary density (cpCD) of four glaucomatous optic disc phenotypes in 193 eyes of 141 glaucoma patients and cpCD in 92 eyes of 55 healthy subjects from the Diagnostic Innovations in Glaucoma Study (DIGS) were compared. Areas under the receiver operating characteristic curves (AUROC) were used to evaluate diagnostic accuracy among groups after adjusting for confounders. RESULTS Four glaucoma phenotypes were assessed including focal ischemic (n=45), generalized cup enlargement (n=60), myopic glaucoma (n=38), and senile sclerotic (n=50). Sex, mean ocular perfusion pressure, intraocular pressure, MD, and the quality score did not differ among phenotypes. However, there were differences in age (p=0.050), race (p=0.039), axial length (p=0.033), and retinal nerve fiber layer thickness (p<0.001) among the groups. After adjusting for confounders, senile sclerotic discs had the lowest cpCD (37.1% [95% CI, 35.3-38.8]) followed by focal ischemic (41.8% [40.0 - 43.6]), myopic glaucoma (42.1% [40 - 44.2]), and generalized cup enlargement (45.5% [44 - 47]) (p<0.001) discs. The adjusted AUROC curves of cpCD for discriminating between healthy and glaucomatous eyes were highest in senile sclerotic eyes (0.928) and lowest in generalized cup enlargement eyes (0.704). CONCLUSIONS OCTA-measured vessel density differs among optic disc phenotypes. Clinicians should be aware that the performance of OCTA for glaucoma diagnosis may be influenced by the optic disc phenotype.