Glaucoma visual field analysis by computed profile of nerve fiber function in optic disc sectors

Automated perimetry has decreased the subjective aspects of data collection, but analysis has remained largely subjective. A microcomputer permits more objective analysis by regrouping and averaging data points in the threshold static visual field according to their retinotopic projection onto the optic disc rather than according to their eccentricity from the point of fixation. The applications of the technique include (1) following glaucomatous visual field loss, (2) differentiating glaucomatous from other forms of visual loss, and (3) studying the effects of aging on the visual field. Six formulas for data analysis are described, and their relative usefulness discussed. Percent loss or gain seemed to convey the most diagnostic information to the clinician. Percent of expected sensitivity was less than the decimal visual acuity when the diagnosis was glaucoma but greater when the diagnosis was cataract. In some cases this analytic method should provide information that could favorably affect patient management.