Multifocal contact lens
AssigneeHanita Lenses Ltd.
InventorMenachem Porat
Life of this patent
Estimating the term…
Abstract
A multifocal contact lens having a posterior surface and an anterior surface, includes a distance vision segment and a near vision segment, and at least one hole through which the posterior surface and the anterior surface communicate with each other.
Claims12
A multifocal lens having a posterior surface and an anterior surface for use on an eyeball having a cornea region, comprising an upper distance vision segment for distance viewing, and a lower near vision segment for near viewing, wherein at least one hole is provided through which said posterior surface and said anterior surface communicate with each other to prevent the generation of over- or underpressures that impair the movement of the lens relative to the eyeball, said at least one hole, or if more than one hole is present, all of said holes, being located in said near vision segment of said lens and arriving outside of said cornea region during distance viewing.
A multifocal contact lens having a posterior surface and an anterior surface for use on an eyeball having a cornea region which comprises:
- a top portion which includes a distance vision segment;
- a bottom portion which includes a near vision segment;
- and
- at least one hole extending through the bottom portion of the lens to prevent the generation of over- or underpressures that impair movement of the lens relative to the eyeball,
- wherein said at least one hole, or if more than one hole is present, all of said holes arrive outside of the cornea region when said cornea region is aligned for viewing through the distance vision segment.
A multifocal lens having a posterior surface and an anterior surface for use on an eyeball having a cornea region, which comprises:
- a top and a bottom half, said top half including a distance vision segment and said bottom half including at least a near vision segment, said bottom half including at least one hole, or if more than one hole is present, all of said holes, extending from the posterior to the anterior surface to allow for communication therebetween,
- wherein said hole or holes prevent the generation of over- or underpressures that impair movement of the lens relative to the eyeball and said at least one hole, or if more than one hole is present, all of said holes, is positioned outside of the cornea region when said cornea region is aligned for distance viewing through the distance vision segment so as to not interfere with distance viewing.
Dependencies are inferred from the claim text.