Soft contact lens having toric rear face and rotationally symmet

Details Soft contact lens having toric rear face and rotationally symmet Soft contact lens having toric rear face and rotationally symmet

1994-12-22

1995-10-03

Nelms, David C.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351161, 351176, G02C 704

Patent

active

054556414

ABSTRACT:
The soft toric contact lens has a substantially rotationally symmetrical front face optionally having a rotationally symmetrical lenticular construction, and a substantially aspherical, especially ellipsoidal, rear face. The optically active central region of the rear face is toric. Shifting the torus to the central region of the lens rear face results in lenses that are economic to produce, are of wearable thickness and are straightforward to fit.

REFERENCES:
patent: 3670460 (1972-06-01), Oldfield
patent: 4068413 (1978-01-01), Suddarth
patent: 4095878 (1978-06-01), Fanti
patent: 4155962 (1979-05-01), Neefe
patent: 4256369 (1981-03-01), Wichterle
patent: 4508436 (1985-04-01), Sitterle
patent: 5069542 (1991-12-01), Hofer

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