Ophthalmic lenses having a progressively variable focal power

Details Ophthalmic lenses having a progressively variable focal power Ophthalmic lenses having a progressively variable focal power

1989-02-22

1991-01-29

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

049881825

ABSTRACT:
An ophthalmic lens having a progressively variable refracting power, includes a portion for distance vision which has a refracting power of a far scene along a principal meridional curve, a portion for near vision which has a refracting power of a near scene, and an intermediate portion defined between the portions for distance vision and near vision to connect these portions by continuously changing refracting power. Changes in curvature .rho.m along the principal meridional curve and curvature .rho.s along a direction perpendicular thereto are optimized on the principal meridional curve, thereby detecting an optimal shape. The curvature .rho.m along the principal meridional curve and the curvature .rho.s in a direction perpendicular to the principal meridional curve are maximum in an upper position in the portion for near vision on the principal meridional curve, decreased toward a periphery of the portion for near vision along the principal meridional curve, substantially satisfy condition .rho.m=.rho.s in an area from at least a lower position in the portion for distance vision to almost the center of the intermediate portion, and satisfy condition .vertline..rho.m-.rho.s.vertline..noteq.0 in the area from the center of the intermediate portion to the portion for near vision. The ophthalmic lens has a shape which satisfies the above requirements.

REFERENCES:
patent: 4240719 (1980-12-01), Guilino et al.
patent: 4640593 (1987-02-01), Shinohara
Optica Acta International Journal of Optics, vol. 10, No. 3, 1963, pp. 223-227.

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