Concentric bifocal contact lens

Details Concentric bifocal contact lens Concentric bifocal contact lens

1983-09-20

1987-01-13

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

046360492

ABSTRACT:
In accordance with the disclosure there is provided a thin circular lens body formed of a single piece of plastic material. The body has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye. The lens body has a near power correction region of circular periphery in the central portion thereof, surrounded by a concentric distance power annular correction region. The near power central region has an area which is substantially equal to half the pupil area of the eye under average reading light conditions.

REFERENCES:
patent: 3037425 (1962-06-01), DeCarle
patent: 3726587 (1973-04-01), Kendall
patent: 4199231 (1980-04-01), Evans
Mandel, R. B.; Contact Lens Practice: Hard & Flexible Lenses; Charles C. Thomas; Springfield, Ill.; pp. 649-661.
Kendall, C. A.; "Ultrafocal.RTM. Bifocal Contact Lens"; Contacto; Jan. 1976; pp. 31-35.

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