Annular mask contact lenses

Details Annular mask contact lenses Annular mask contact lenses

1991-11-12

1993-09-14

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

052453677

ABSTRACT:
An annular mask contact lens designed to operate with the normal functioning of the human pupil. An annular mask forms a small pinhole-like aperture on the contact lens enabling continual focus correction. The outer diameter of the annular mask allows the patient to transmit more light energy through the pupil as brightness levels decrease. The contact lens may be fitted with two separate and distinct optical corrections, both at he small aperture region and in the region beyond the annular mask. Functional imaging is thus achieved for both bright and dim lighting, and over a wide range of viewing distances.

REFERENCES:
patent: 3557261 (1971-01-01), Wichterle
patent: 3794414 (1974-02-01), Wesley
patent: 4955904 (1990-09-01), Atebara et al.
Fontana, "Coping with the Nystagmoidalbino: Lens Designs that Really Work", Review of Optometry, Dec., 1979, p. 36.
Takahashi, "The Use and Interpretation of the Pinhole Test", Optometric Weekly, vol. 56, No. 18, May 6, 1965, pp. 83-86.
"A Pinhole Contact Lens", The Optician, Jun. 23, 1950, p. 623.
Sefchek, "Latest Cosmetic Bifocal Fitting Technique".
Wesley, "Research on the Multi-Range Lens".
Sefchek, "An Interim Report: Field Studies of Cosmetic Bifocal Contact Lens Patients".

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