Bifocal contact lens

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

Patent

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Details

351177, G02C 704, G02C 706

Patent

active

046182292

ABSTRACT:
A ballasted multifocal contact lens has a vent for releasing constrictive pressure provided in its lower and ballasted portion. The vent has a surface which tapers from the anterior surface toward the posterior surface to allow the lens to be positioned below the inferior lid. A stabilizing portion is formed on the lens adjacent each side of the vent. The stabilizing portions engage the inferior lid and adjust the lens should it be rotated off axis.

REFERENCES:
patent: 3212097 (1965-10-01), Adler
patent: 3937566 (1976-02-01), Townsley
patent: 4297008 (1981-10-01), Woodford
patent: 4324461 (1982-04-01), Salvatori
patent: 4508436 (1985-04-01), Sitterle
"Dimple Contact Lenses", A. Tajiri--American Journal of Optometry & Archives, vol. 42, #4; 4/1965, pp. 248, 249.

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