Ophthalmic lenses

Details Ophthalmic lenses Ophthalmic lenses

1976-06-11

1978-11-07

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

041242823

ABSTRACT:
An ophthalmic lens for providing correction of distortion of the vertical position of an image in a lens prescribed for the condition of anisometropia comprises upper and lower portions having different optical centers. The lens surfaces of the upper and lower portions merge in a transverse band providing a smooth transition between the upper and lower lens surfaces over a vertical distance for example of 2 - 8 mm. The transverse band removes the conventional sharply visible boundary between the upper and lower lens surfaces and by introducing aberration into the lens at this point deters effective use of the lens over an angle of vision corresponding substantially to the angle of a cone of light entering the pupil of the eye and so prevents double vision occurring at the boundary of the lens surfaces. Methods of production of the lens are also disclosed.

REFERENCES:
John E. Archer, "Evaluation and Application . . ." Optometric Weekly, vol. 47, No. 46, Nov. 15, 1956, pp. 2066-2067.
Henry A. Knoll, "The Optical Characteristics . . .," Amer. J. Optom. & Archives . . ., vol. 39, No. 10, Oct. 1962, pp. 538-542.

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