Variable focus type eyesight correcting apparatus

Details Variable focus type eyesight correcting apparatus Variable focus type eyesight correcting apparatus

1995-03-27

1997-07-01

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351172, G02C 706, G02C 708

Patent

active

056443749

ABSTRACT:
A variable focus type eyesight correcting apparatus in which a plurality of optical lenses are superimposed on each other and in which a refracting power is changed by relatively sliding the lenses in the direction of the superimposed surfaces, achieves a reduction of astigmatism, assurance of uniform refracting power, prevention of diffused reflection, which could be caused if a plurality of refractive surfaces are present, and miniaturization of lens system. When a change of astigmatism in each constituent lens in the variable focus type eyesight correcting apparatus is expressed by contours spaced at intervals of arbitrary diopter, the contours are arranged to be substantially linear and parallel to the principal meridian. The astigmatism becomes absent and the refracting power becomes constant in the region where the eyeglass lenses of the present invention are superimposed on each other, whereby the lenses of the invention can have the optical performance identical to that of single focal lens.

REFERENCES:
patent: 3305294 (1967-02-01), Alvarez
patent: 3485556 (1969-12-01), Naujokas
patent: 3507565 (1970-04-01), Alvarez et al.
patent: 3583790 (1971-06-01), Baker

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