Multifocal birefringent lens system

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

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350379, 350411, 351161, 351168, G02B 108, G02C 706

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active

049813420

ABSTRACT:
A multifocal birefringent lens system is described together with applications of the lens system such as ophthalmic lenses (including those of the intraocular, contact and spectacle type) and optical instruments and devices including photographic cameras, telescopes, microscopes, copiers, spectrographic instruments, etc.

REFERENCES:
patent: 3520592 (1970-07-01), Leib et al.
patent: 3551027 (1970-12-01), Alexander III
patent: 3758201 (1973-09-01), MacNeille
patent: 4446305 (1984-05-01), Rogers et al.
patent: 4566762 (1986-01-01), Kato
patent: 4643534 (1987-02-01), Chun et al.
Osipov, "Binary Polarizing Lenses," Optical Technology, vol. 40, No. 5, May 1973, pp. 277-279.
Eng et al., "Multiple Imagery With Birefringent Lenses," Applied Optics, vol. 8, No. 10, Oct. 1969, pp. 2117-2120.
IBM Technical Disclosure Bulletin, "Method For Aligning The Axes of a Birefringent Bifocal Lens System," vol. 27, No. 11, Apr. 1985, pp. 6674-6675.
Caulfield. "Digital Control of Focal Distances, " Applied Optics, vol. 6, No. 3, Mar. 1967, pp. 549-551.
Meyer-Arenot, Introduction to Classical And Modern Optics, 2nd ed., 1984, Prentice-Hall, London, pp. 336-339.
Born et al., Principles Of Optics, 6th ed., 1980, Pergamon Press, Oxford, pp. 684-707.
Fincham et al., Optics, 9th ed., 1980, Buttersworth, London, pp. 340-346.

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