Aspherical spectacle lens

Details Aspherical spectacle lens Aspherical spectacle lens

1993-01-29

1994-10-04

Look, Edward K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351167, 359708, G02C 702, G02B 304

Patent

active

053530721

ABSTRACT:
In an aspherical spectacle lens having a negative degree and an aspherical surface of rotational symmetry located on an object side, a surface power of the aspherical surface of rotational symmetry at a center portion located on an axis of rotational symmetry is substantially 0 diopter, and the aspherical surface of rotational symmetry is of an apparent convex shape.

REFERENCES:
patent: 4181409 (1980-01-01), Whitney et al.
patent: 4504128 (1985-03-01), Guilino et al.
patent: 4538887 (1985-09-01), Bristol
patent: 4613217 (1986-09-01), Fuerter et al.
patent: 4856889 (1989-08-01), Guilino et al.
patent: 5050979 (1991-09-01), Shinohara
patent: 5054904 (1991-10-01), Bristol

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