Owing to an increase in popularity of gonioscopy, a demand has been created for a less expensive diagnostic contact glass. Following Dr. Jonas S. Friedenwald's suggestion, Gradle1 constructed a diagnostic contact lens made of lucite2 which he demonstrated at the meeting of the American Ophthalmological Society in San Francisco in June 1938. I had at that time constructed a molded contact glass of lucite3 which has characteristics and optical principles similar to those of the Koeppe glass and different from those of the Gradle lens. The stemlike feature of the latter was incorporated as a detachable handle in order to add to its convenience.
The present lens, shown in the accompanying illustration, is used in the examination of the anterior chamber angle in the same manner as the regular Koeppe lens. This lens has an inherent magnification of X 1½. This means that 50 per cent more
Barkan O. A DIAGNOSTIC CONTACT LENS MADE OF LUCITE. Arch Ophthalmol. 1940;24(4):798. doi:10.1001/archopht.1940.00870040184019
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