Soft bifocal contact lens

Details Soft bifocal contact lens Soft bifocal contact lens

1991-04-25

1992-08-25

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, G02C 704

Patent

active

051413019

ABSTRACT:
A translational soft multi-focal contact lens includes a near-vision portion located in the upper approximate one-third of the optical zone of the lens. A thin, upper portion is formed by a base-down prism in the contact lens which is pushed by the upper eyelid to move the lens downwardly in relation to the cornea, with the thickest part of the lens below the upper lid to assist downward movement, as the lower lid moves down. It also translates down in upward gaze, and laterally and down in sidewards and downward gaze.

REFERENCES:
patent: 3279878 (1966-10-01), Long
patent: 3300909 (1967-01-01), Cooper et al.
patent: 3472581 (1969-10-01), Bronstein
patent: 3485556 (1969-12-01), Naujokas
patent: 3684357 (1972-08-01), Tsuetaki
patent: 4174156 (1979-11-01), Glorieux
patent: 4199231 (1980-04-01), Evans
patent: 4324461 (1982-04-01), Salvatori
patent: 4418991 (1983-12-01), Breger
Green, M.; "Preliminary Report on a New Bifocal Contact Lens"; Contacto; vol. 5, No. 3; Mar. 1961; pp. 83,84,86-89.
Pacific Contact Lab. Inc.; The Optical Journal & Review of Optometry; Mar. 15, 1961; p. 72.

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