Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1979-11-26
1982-04-13
Clark, Conrad J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351161, G03B 2146
Patent
active
043244610
ABSTRACT:
A contact lens for the correction of astigmatism or presbyopia and for the correction of "high riding" lenses being of lenticular construction. This invention avoids unwanted increase in center thickness of the lens and unwanted prism in the central area. The curved lenticular carrier portion of the lens, the non-visual portion, is constructed with a concentric curve cut which produces a thick lens edge. The lenticular carrier is also provided with a second eccentric curve cut, with respect to the visual axis of the lens, to provide a thickness disparity between the superior and inferior portions of the lens and to provide an offset center of gravity and a desirable rotational positioning of the lens in the eye of a wearer, particularly when the lens is of astigmatic or bifocal type.
REFERENCES:
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patent: 3431327 (1969-03-01), Tsuetaki
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patent: 3726587 (1973-04-01), Kendall
patent: 3962505 (1976-06-01), Avery
patent: 4071293 (1978-01-01), Avery
Moss, Herbert L., "Semi-Sclero-Corneal Flange Lens for Correcting Residual Astigmatism", Journal of the American Optometric Assoc., vol. 31, No. 1, Aug. 1960, pp. 57, 58.
Hersh, Donald, "Use of Eccentrically Ground Secondary Curve in Relief of `Fine` Contact Lens Symptoms", The Optometric Weekly, vol. 51, No. 8, pp. 377-380, Feb. 1960.
Mandell, Robert B., "A No-Jump Bifocal Contact Lens", Optometric Weekly, vol. 58, No. 22, Jun. 1, 1967, pp. 19-21.
Braff, Solon M., "A New Corneal Lens Design for the Correction of Residual Astigmatism", The Optometric Weekly, vol. 61, No. 1. Jan. 1970.
Clark Conrad J.
Salvatori Ophthalmics, Inc.
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