Opthalmic lens having a positive refractive power

Details Opthalmic lens having a positive refractive power Opthalmic lens having a positive refractive power

1995-06-07

1997-03-11

Epps, Georgia Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351159, G02C 702

Patent

active

056106700

ABSTRACT:
An aspherical ophthalmic lens having a positive refractive power, an axis of symmetry and a periphery includes front and rear refractive surfaces. The front refractive surface has a meridional plane and a sagittal plane that intersects the meridional plane. The sagittal plane has a sagittal plane curvature of .rho..sub.s, and the meridional plane has a meridional plane curvature of .rho..sub.m. A curvature difference Z, defined as Z=.rho..sub.m -.rho..sub.s, decreases from at least approximately 20 mm from the axis of symmetry in a direction toward the periphery. As a result, a thinner and flatter lens having superior optical performance is provided.

REFERENCES:
patent: 3960442 (1976-06-01), Davis et al.
patent: 4289387 (1981-09-01), Jalie
patent: 4504128 (1985-03-01), Guilino et al.
patent: 5050979 (1991-09-01), Shinohara
patent: 5050980 (1991-09-01), Shinohara
patent: 5235357 (1993-08-01), Winthrop et al.

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