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—A driver with normal vision can be used fairly to judge the bioptic telescopic spectacle (BTS) because both the small magnified area and the area blinded to traffic while changing fixation to read the road sign are the same as seen through the telescope, whether the vision is 20/20 or 20/200. The hazardous blind area in the field is not related to the central vision.There is no evidence that the BTS is a safe device for operating a motor vehicle. The evidence is that the BTS is more of a hazard than an aid. Approach magnification has the obvious advantage of always being available. Furthermore, it can be varied, it does not impair the peripheral vision, and it is safer.The states have an obligation to the visually handicapped to grant a waiver for impaired vision, otherwise the states are endorsing the exploitation of the handicapped by
Fonda G. Bioptic Telescopic Spectacle: A Hazard for Operating a Motor Vehicle?-Reply. Arch Ophthalmol. 1984;102(8):1119–1120. doi:10.1001/archopht.1984.01040030901002
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