Abstract
A laser accident patient's parafoveal visual field defect was modeled and his perform- ance on a tank recognition task was compared with that of a participant in the modeled scotoma condition and in two central scotoma conditions. The modeled parafoveal scotoma, and foveal and macular occluding scotomas were stabilized on the retina using a dual Purkinje Eye-Tracker and a multiplane digital image display. The simulated scotomas suppressed military target recognition functions in a manner consistent with previous studies. Neither central nor parafoveal scotomas were sufficient to reduce sensitivity to the patient's level. However, when the foveal and parafoveal scotoma functions were combined to account for the patient's macular damage, prediction for patient performance significantly improved. The data suggest that models of retinal damage from laser exposure must include not only visual field deficits but also deficits in high (visual acuity) and low spatial frequency visual function.
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