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April 1940


Author Affiliations

McKeesport, Pa.

Arch Ophthalmol. 1940;23(4):839. doi:10.1001/archopht.1940.00860130933011

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A new lens is here presented which will overcome the objections to the appearance of strong concave lenses and especially do away with the sharp line which marks the periphery of the concave part of the myodisk lens.

This lens is similar to the myodisk lens, but the sharp edge of the concave part of the latter, which is so conspicuous, is replaced by a gradual curve. The margin of the lens is also cut down by a gradual curve to the thickness which is suitable for rimless mountings.

Possibly originality may not be claimed for cutting down the periphery of these concave lenses, as others may have done some work in that direction. The distinctive feature of the lens is that the sharp edge of the myodisk lens is cut down and is replaced with a gradual curve which is not so conspicuous. The accompanying diagram shows cross sections

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