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From the Archives of the Archives
June 1999

A look at the past . . .

Arch Ophthalmol. 1999;117(6):810. doi:10.1001/archopht.117.6.810

Bifocal glasses cataract patients. Dr. W. THOMPSON exhibited a pair of bifocal glasses, made by Borsch, where the refraction in the lower half of glasses increased 2 D., by adding a segment of flint glass to the remaining crown glass. The resulting combination is also achromatic.

Reference:Arch Ophthalmol. 1897;26:437.