Aspherical lens for indirect ophthalmoscope

Details Aspherical lens for indirect ophthalmoscope Aspherical lens for indirect ophthalmoscope

1982-09-28

1984-09-04

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351205, A61B 312, G02B 1318

Patent

active

044694130

ABSTRACT:
An aspherical lens for an indirect ophthalmoscope, comprising a single biconvex lens having a first surface with a radius of curvature r.sub.1, and a second aspherical surface facing the examiner and having a paraxial radius of curvature r.sub.2. The lens being constructed to meet the following requirements: ##EQU1## where D is the effective diameter of the lens, y is the displacement in the direction of an optical axis of an aspherical shape as expressed by a rectangular coordinate system having the origin at the vertex of the second surface and normalized by r.sub.2, and x is the displacement in a direction normal to the optical axis and also normalized by r.sub.2 .

REFERENCES:
patent: 3914032 (1975-10-01), Takano et al.
patent: 4222634 (1980-09-01), Muchel

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