To assess the association of visual field, vertical cup-disc (VC/D) ratio, and vertical height of optic chiasm.
Outpatient eye clinic.
Eighteen patients with low, normal, or elevated intraocular pressure, with or without visual field defects.
Measurement of visual field, VC/D ratio, and vertical height of optic chiasm.
Main Outcome Measures:
Association between VC/D ratio and visual field defects compared with association between vertical height of optic chiasm and visual field defects.
Visual field defects were graded as 0, 1 to 10, and 11 to 20 (from least to most severe). Group mean VC/D ratios were 0.47 (0), 0.55 (1-10), and 0.69 (11-20) for right eyes and 0.48(0), 0.57 (1-10), and 0.75 (11-20) for left eyes. The significance level for trend was P=.02 for right eyes and P=.006 for left eyes. Group mean chiasm heights were 3.5 (0), 2.9 (1-10), and 2.2 (11-20) mm for right eyes and 3.5 (0), 2.8 (1-10), and 2.2 (11-20) mm for left eyes. The significance level for trend was P<.001 for right eyes and P=.002 for left eyes. To assess the simultaneous effects of VC/D ratio and chiasm height on the visual field defects groups, we used ordinal logistic regression models. Models with both variables implied that chiasm height was a stronger predictor of visual field defects group than VC/D ratio (for right eyes, P=.04 [VC/D ratio], P=.001 [chiasm height]; for left eyes, P=.11 [VC/D ratio], P=.005 [chiasm height]).
When chiasm and VC/D ratio were analyzed in the same model, chiasm height was a stronger predictor of visual field defects. In advanced visual field defects, the optic chiasm is atrophic.
Iwata F, Patronas NJ, Caruso RC, et al. Association of Visual Field, Cup-Disc Ratio, and Magnetic Resonance Imaging of Optic Chiasm. Arch Ophthalmol. 1997;115(6):729–732. doi:10.1001/archopht.1997.01100150731006
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