Refractor optical system

Details Refractor optical system Refractor optical system

A - Human Necessities

61

B

88/121.5

A61B 3/02 (2006.01)

Patent

CA 1128794

Abstract of the Disclosure The specification describes an improvement in a refractor optical system having a strong sphere dial, a weak sphere dial, a strong cylinder dial and a weak cylinder dial, each dial containing a plurality of lenses and rotatable about a common axis to selectively present an individual lens on a test axis. The improvement comprises a lens series in which one of the dials has all lenses of substantially the same index of refraction, each lens having substantially the same center thickness and a planar surface on the side of the lens furthest from the patient's eye and the one of the dials being located at a reference plane of the refractor and having a planar plate as a lens in a position of zero diopter power, dm:

368069

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