LAUSR

PURPOSE Compare rates of change of macular ganglion cell/inner plexiform (GCIPL) thickness and proportion of worsening and improving rates from two OCT devices in a cohort of glaucoma eyes. METHODS Design: Longitudinal cohort study. SETTING Tertiary glaucoma clinic. PATIENTS 68 glaucoma eyes with ≥2 years of follow-up and ≥4 OCT images. OBSERVATION PROCEDURES Macular volume scans from 2 OCT devices were exported, co-registered, and segmented. Global and sectoral GCIPL data from the central 4.8 × 4.0 mm region were extracted. GCIPL rates of change were estimated with linear regression. Permutation analyses were used to control specificity with the 2.5%ile cutoff point used to define 'true' worsening. MAIN OUTCOMES MEASURES Differences in global/sectoral GCIPL rates of change between two OCT devices and proportion of negative vs. positive rates of change (p<0.05). RESULTS Average (SD) 24-2 visual field mean deviation, median (IQR) follow-up time, and number of OCT images were -9.4 (6.1) dB, 3.8 (3.3-4.2) years, and 6 (5-8), respectively. GCIPL rates of thinning from Spectralis OCT were faster (more negative) compared with Cirrus OCT; differences were significant in superonasal (p=0.03) and superotemporal (p=0.04) sectors. A higher proportion of significant negative rates was observed with Spectralis OCT both globally and in inferotemporal/superotemporal sectors (p<0.04). Permutation analyses confirmed the higher proportion of global and sectoral negative rates of change with Spectralis OCT (p<0.001). CONCLUSIONS Changes in macular GCIPL were detected more frequently on Spectralis' longitudinal volume scans than those of Cirrus OCT. OCT devices are not interchangeable with regard to detection of macular structural progression.