Flexible liquid crystal-containing lenses
AssigneeCooperVision International Limited
InventorsRobert Oag, Roger Brian Minchin Clarke, Mikhail Bashtanov
Life of this patent
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Abstract
An electrically-switchable flexible contact lens for conforming to an eye of a user is provided. The lens comprises a liquid crystal cell for changing a focal power of the contact lens, and the liquid crystal cell has a cell gap thickness between a first inner surface and a second inner surface, the liquid crystal cell comprising a diffractive optical element for correcting the vision of a user, wherein the diffractive optical element is arranged to maintain the cell gap thickness by providing support at one or more locations within the cell.
Claims13
An electrically-switchable flexible contact lens for conforming to an eye of a user, the lens comprising:
- a first liquid crystal cell for changing a focal power of the contact lens, and having a cell gap thickness between a first inner surface and a second inner surface,
- the first liquid crystal cell comprising a diffractive optical element for correcting the vision of a user,
- wherein the diffractive optical element is arranged to maintain the cell gap thickness by providing support at one or more locations within the cell, and
- the diffractive optical element comprises an inner portion and an outer portion, a maximum height of the diffractive optical element at the outer portion being greater than a maximum height of the diffractive optical element at the inner portion such that the diffractive optical element at the outer portion provides support to and spaces the first inner surface and the second inner surface at a greater distance at an outer region of the first liquid crystal cell than an inner region of the first liquid crystal cell.
Dependencies are inferred from the claim text.