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Note on the Focus of Concavo - Convex Lenses the Surfaces of which are of Equal Curvature

Published online by Cambridge University Press:  15 September 2014

George A. Berry
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Extract

The ophthalmic surgeon has frequently to prescribe convex lenses of less than four inches focus for the correction of the optical defect in the eye left by removal of the intransparent crystalline lens in the operation for cataract. Occasionally, too, equally strong concave lenses are required to correct high degrees of short sight.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 20 , 1895 , pp. 192 - 195
Copyright
Copyright © Royal Society of Edinburgh 1895

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