Tear pump contact lens

Details Tear pump contact lens Tear pump contact lens

1984-09-13

1987-02-03

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

046405941

ABSTRACT:
This invention relates to improvements in ophthalmic lenses and in particular to a three zone lens having a central optical portion connected by and secured to an intermediate tear pump zone which is secured and connected to an outer zone for retaining the lens on the eye. The central zone may function as a correction of vision or as a protection for the cornea of the eye. This central zone acting in conjunction with the intermediate tear pump zone of a bellow shape combine to form a pumping mechanism that is activated by the normal blinking of the eyelid. This pumping action causes tear fluid to be expelled and replenished in the area located behind the central zone and above the cornea of the eye. The fluids ingress and egress from this area through the tear layer located between the outer zone of the lens and the surface of the eye.

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