Spectacle lens having astigmatic power

Details Spectacle lens having astigmatic power Spectacle lens having astigmatic power

1984-01-25

1986-09-23

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351159, 351177, G02C 702

Patent

active

046132171

ABSTRACT:
The invention contemplates an astigmatic-power lens having at least one lens surface which differs from spherical or toric shape and which is characterized by the fact that, for each elemental region of said lens surface, the principal curvatures and the principal curvature-directions are so selected that the astigmatism of the spectacle lens and of the eye to be corrected are optimally adapted as to direction and extent.

REFERENCES:
patent: 3722986 (1973-03-01), Tagnon
patent: 3960442 (1976-06-01), Davis et al.
patent: 4300817 (1981-11-01), Betensky
patent: 4310225 (1982-01-01), Davis
Rigler, A. K. et al., "Spline Functions: An Alternative Representation of Aspheric Surfaces; Applied Optics; vol. 10, No. 7; pp. 1648-1651; Jul. 1971.

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