Diffractive ophthalmic lens for correcting astigmatism

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

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351161, 359565, 359569, 359570, 359571, 359575, 623 6, G02C 704, G02B 2742, A61F 216

Patent

active

051002264

ABSTRACT:
An artificial eye lens such as a contact lens or intra-ocular lens corrects astigmatism by two sets of substantially linear parallel zones arranged to diffract light predominantly into one order at one orientation, the spacing of the zones diminishing on either side of the linear axis. In addition circular diffraction zones may be provided to give both spherical and cylindrical power for astigmatism correction.

REFERENCES:
patent: 3973850 (1976-08-01), Povey
patent: 3985443 (1976-10-01), Danielsson et al.
patent: 4162122 (1979-07-01), Cohen
patent: 4642112 (1987-02-01), Freeman
"Elliptical and hyperbolic zone plates," C. Gomez-Reino et al., Applied Optics, vol. 19, No. 9, May 1980, pp. 1541-1545, New York.
"Diffraction Characteristics of Square Zone Plates," L. J. Janicujevic, Journal of Optics, vol. 13, Aug. 1982, pp. 199-205, Paris.
"Diffraction of Gaussian Beams Through Different Types of Zone Plates," L. J. Janicijevic, Journal of Optics, vol. 18, No. 1, 1987, pp. 23-25, 42, Paris.

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