Corneal contact lenses

Details Corneal contact lenses Corneal contact lenses

G - Physics

02

C

G02C 7/04 (2006.01) G02C 7/06 (2006.01)

Patent

CA 2070832

2070832 9109336 PCTABS00005 In multifocal corneal contact lenses, the lenses of each pair (4a, 4b) have a different geometric configuration and/or distribution of focal zones (4c, 4d, 4e, 4f, 4g, 4h). The zones (4c, 4d, 4e, 4f, 4g, 4h) are distributed to provide vision corrections of different kinds for the two eyes of a patient under different illumination conditions. In monovision type corneal contact lenses, one or bothlenses (44a, 44b) is provided with one or more auxiliary correction zones (44e, 44h) each having a focal length different from the focal length of the major portion of the respective lenses. In any lens in accordance with the invention, the portion of the principal correction zones coextensive with the pupil of the respective eye covers more than approximately two-thirds (more preferably seventy-five percent and most preferably eighty percent) of the area of the pupil. This upper limit on the pupil area covered by the auxiliary zones is satisfied regardless of the disposition of the respective contact lens on the eye and regardless of the size of the respective pupil.

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