Progressive multifocal ophthalmic lens

Details Progressive multifocal ophthalmic lens Progressive multifocal ophthalmic lens

1986-10-08

1988-10-18

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351168, G02C 706

Patent

active

047782668

ABSTRACT:
A progressive multifocal ophthalmic lens has a main meridian along at least part of which the curvature of the lens varies continuously. On each side of the main meridian the areas of aberration are symmetrical to each other. The main meridian intersects a horizontal plane through the optical center of the lens at a point which, relative to a vertical plane passing through the optical center, is spherically offset towards the nose. This offset is between 0.8 and 1.33 millimeters. The plane containing the main meridian is at an angle between 5.5 degrees and 7.5 degrees to the vertical plane. The main meridian converges towards the nose in the lower part of the lens.

REFERENCES:
patent: 3785724 (1974-01-01), Maitenaz
patent: 4580883 (1986-04-01), Shinohara

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