Visual Segmental Rim Assessment In Primary Open Angle Glaucoma

1. Vinay Nangia¹
2. Ajit Sinha¹
3. Rajesh Gupta¹

¹Suraj Eye Institute, Nagpur. India

Purpose: Moorfields regression analysis (MRA) is an important indicator of optic disc rim abnormality in glaucoma on confocal scanning laser ophthalmoscopy (CSLO). It was the purpose to visually assess the optic disc rim in association with MRA.

Methods. 95 eyes ( 47 right eye and 48 left eyes )of 67 POAG subjects , diagnosed on the basis of the optic disc damage and visual field loss underwent an ophthalmic evaluation including optic disc photography and CSLO. The optic disc, and its superior, inferior, nasal and temporal rims were graded as normal, suspicious or abnormal. The mean disc area was 2.21+0.36mm2.

Results: The mean defect was 10.1+8.8dbs. Mean C/D area ratio was 0.56+0.21 and mean rnflt was 0.138+0.069mm. MRA classified 48 discs as abnormal, 14 as suspicious and 33 as normal. Visual assessment classified 71 discs as abnormal, 6 as borderline and 18 as normal. MRA was abnormal for inferior disc in 54 versus 69 eyes with visual assessment and for superior disc in 38 versus 67 eyes visually.

Conclusions: The optic disc rim and its segments were found to be abnormal more commonly on visual assessment compared to MRA in POAG patients with a mean defect of 10.1 dbs. The MRA was found to be abnormal most frequently for the inferior optic disc rim, whereas visual rim abnormality was assessed to be equally common for all segments in this group of subjects. MRA and visual clinical cues may provide additional synergy in glaucoma assessment.