Progressive power lens

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

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G02C 706

Patent

active

055573487

ABSTRACT:
A progressive power lens of the present invention comprises, along a principal meridional curve, a portion for distance vision having a refracting power corresponding to a distant view, a portion for near vision having a refracting power corresponding to a near view and an intermediate portion, located between the portion for distance vision and the portion for near vision, for continuously connecting the refracting powers of the portion for distance vision and the portion for near vision. When an average refracting power (diopter) of a lens refracting surface at a center for distance vision is S.sub.0 and an additional power of said lens refracting surface is A.sub.D, from a center for distance vision to lateral side areas of the center for distance vision in a worn state, when a mean power (diopter) of each point of the lens refracting surface is S.sub.E and the difference between the mean power S.sub.E of each point of the lens refracting surface and the mean power S.sub.0 of the center for distance vision is .DELTA.S.sub.E (i.e., .DELTA.S.sub.E =S.sub.E -S.sub.0), the following condition holds:

REFERENCES:
patent: 5000559 (1991-03-01), Takahashi et al.
Guilino, G. H., "Design Philosophy for Progressive Addition Lenses", Applied Optics, vol. 32, No. 1, Jan. 1, 1993, pp. 111-117.
Sawusch, M. R. et al, "Optimal Astigmatism to Enhance Depth of Focus After Cataract Surgery", Ophthalmology, vol. 98, No. 7, Jul. 1991, pp. 1025-1029 .

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