Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1992-10-05
1994-09-13
Ben, Loha
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351219, A61B 300, G02C 701
Patent
active
053473264
ABSTRACT:
There is disclosed a diagnostic or therapeutic contact lens for use in examination or treatment of the eye of a patient. The diagnostic or therapeutic contact lens comprises a lens body, constructed of a rigid, transparent material, and includes a concave posterior surface to be selectively positioned on the cornea of an eye. The posterior surface will preferably have a curvature substantially conforming to the curvature of the cornea and will be translationally movable on the cornea during observation or treatment to facilitate examination procedures. The posterior surface of the lens body may include channels for permitting the egress of air from between the posterior surface of the lens body and the surface of the cornea of the eye being examined. The channels may be located about the periphery of the optically functional portion of the posterior surface, such that air trapped in the precorneal region will be immediately displaced from the precorneal space so as to allow tear fluid of the eye to interface between the posterior surface and cornea. Subsequent to examination or treatment using the diagnostic or therapeutic contact lens, the channels for permitting the egress of air from the precorneal region will also facilitate removal of the lens from the cornea. The diagnostic or therapeutic contact lens will eliminate the need for using an ophthalmic solution in association therewith and will also substantially eliminate the creation of suction between the cornea and the contact lens.
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Spiro Vent Contact Lens Guide & Fitting Manual by Contact Lens Guild Inc. Rochester, N.Y. 1959.
Conforma Laboratories Advertisement in Optometric Weekly vol. 56 No. 43 Oct. 28, 1965 p. 15.
Ben Loha
Papalas Michael A.
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