Structure Function Relationships of Vessel Density and Retinal Nerve Fiber Layer Thickness in Early Glaucomatous Eyes With High Myopia

PURPOSE. The purpose of this study was to evaluate the structure function relationship of circumpapillary vessel density (cpVD) with visual field sensitivity (VFS) and compare its characteristics with circumpapillary retinal nerve fiber layer thickness (cpRNFLT) in early glaucomatous (EG) and normal eyes with and without high myopia (HM).METHODS. Seventy-five EG (mean deviation > -6 dB) and 7 normal eyes with HM (axial length [AL] >26.5 mm) and 111 EG and 11 normal eyes without HM were enrolled in this retrospective cross-sectional study. All patients underwent circumpapillary optical coherence tomography (OCT) and OCT angiography (OCTA) scanning with the Cirrus HD-6000 with AngioPlex OCTA (Carl Zeiss Meditec, Dublin, CA, USA). Structure function correlations were determined by comparing global, superior, inferior, and Garway-Heath sectoral values for cpVD and cpRNFLT with its corresponding 24-2 and 10-2 VFS of Humphrey Visual Field (HFA) analyzer.RESULTS. CpVD showed no significant correlations with AL except for the nasal sector (P = 0.044), whereas cpRNFLT demonstrated significant positive association with AL in the global (P = 0.024), nasal (P = 0.020), and temporal (P < 0.001) sectors. In HM eyes, global and sectoral cpVD significantly correlated with corresponding VFS in all 24-2/10-2 VF sectors (all P < 0.05). CpVD-VFS correlation was significantly stronger than cpRNFLT-VFS in the nasal sector of HM eyes (P = 0.002) and temporal and inferior temporal sector of eyes without HM (P = 0.008 and P = 0.042, respectively).CONCLUSIONS. In EG eyes with HM, cpVD was less affected by AL in comparison to cpRN-FLT and cpVD-VFS correlation was significant in all 24-2/10-2 VF sectors. AL-associated advantages of cpVD-VFS over cpRNFLT-VFS were observed.