Optic disc assessment using confocal scanning laser ophthalmoscope in normal tension glaucoma with disc hemorrhage

Purpose To evaluate which optic disc parameters have a relationship with the presence and the location of disc hemorrhages in normal tension glaucoma (NTG) Methods This retrospective study included patients with early NTG with mean deviation with – 10 dB or better in 24‐2 Humphrey visual field analyzer. Eyes in the whole study group were divided into those with and without disc hemorrhage. Optic disc stereometric parameters measured using the Heidelberg Retina Tomograph (HRT) III were compared between each group with and without disc hemorrhage. Within the group with disc hemorrhage, the location of disc hemorrhage was analyzed. Sectoral disc parameters were compared between two common locations where disc hemorrhage developed. Results Forty‐three patients with disc hemorrhage and 46 patients without disc hemorrhage were included in this study. Mean deviation and pattern standard deviation showed no significant difference between two groups. There was no significant difference in global optic disc parameters of HRT between two groups. Disc hemorrhage was displayed mainly in inferotemporal (23 eyes, 53.5%) and in superotemporal (12 eyes, 27.9 %). Regarding to sectoral disc analysis of inferotemporal quadrant, the value of cup shape measure and cup disc area ratio was higher in the disc hemorrhage group compared to the group without disc hemorrhage (P=0.0013, P=0.013, repectively). The subset analysis of disc parameters within the disc hemorrhage group, showed that superotemporal maximum cup depth in eyes with superotemporal disc hemorrhage was greater compared to inferotemporal maximum cup depth in eyes with inferotemporal disc hemorrhage (P=0.017). Conclusion The change of optic disc parameters in early NTG patients with disc hemorrhaCommercial interest