Analysis finds restricted visual fields with telescopic lenses in normally sighted individuals, suggesting caution for drivers.
In some states, persons with significantly reduced visual acuity are being licensed to drive while wearing telescopic spectacle lenses (TSL.) In order to evaluate possible visual field limitations present with these devices, the peripheral visual fields of a group of normally sighted subjects were measured while they wore TSL. Severely restricted central fields and sizeable ring scotomas were present with all units tested. These results indicate that driving with TSL should be discouraged.
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Keller et al. (1976) studied this question.
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