Method for designing non-round soft contact lenses
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsPierre-Yves Gerligand, Philippe F. Jubin, Timothy A. Clutterbuck, Radhakrishnan Damodharan
Life of this patent
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Abstract
A method for optimizing the performance in centration, rotation and stability of contact lenses makes use of the upper and lower eyelid geometries to maximize the lens-lid interaction for two different contact lens positions on the eye. The contact lenses are non-round lenses for maximum interaction with the eyelids.
Claims26
A method for designing non-round contact lenses for improving lens stability, rotation and centration on the eye, the method comprising:
- determining the geometry of an upper eyelid of at least one eye of a patient;
- determining the surface geometry of the ocular surface of at least one eye of the patient;
- setting an initial geometric shape of the outer contour of a non-round contact lens;
- calculating a first surface area overlap between the upper eyelid and a superior portion of the non-round contact lens when the non-round contact lens is at its optimal final position on the eye based upon the geometry of the ocular surface;
- calculating a second surface area overlap between the upper eyelid and a superior portion of the non-round contact lens when the non-round contact lens is at its least optimal position on the eye based upon the geometry of the ocular surface;
- and
- maximizing the difference between the first and second surface area overlaps by changing the geometric shape of the outer contour of the non-round contact lens.
A method for designing non-round contact lenses for improving lens stability, rotation and centration on the eye, the method comprising:
- determining the geometry of a lower eyelid of at least one eye of a patient;
- determining the surface geometry of the ocular surface of at least one eye of the patient;
- setting an initial geometric shape of the outer contour of a non-round contact lens;
- calculating a first surface area overlap between the lower eyelid and an inferior superior portion of the non-round contact lens when the non-round contact lens is at its optimal final position on the eye based upon the geometry of the ocular surface;
- calculating a second surface area overlap between the lower eyelid and an inferior portion of the non-round contact lens when the non-round contact lens is at its least optimal position on the eye based upon the geometry of the ocular surface;
- and
- maximizing the difference between the first and second surface area overlaps by changing the geometric shape of the outer contour of the non-round contact lens.
A method for designing non-round contact lenses for improving lens stability, rotation and centration on the eye, the method comprising:
- determining the geometry of an upper eyelid of at least one eye of a patient;
- determining the surface geometry of the ocular surface of at least one eye of the patient;
- setting an initial geometric shape of the outer contour of a non-round contact lens;
- calculating a first surface area overlap between the upper eyelid and a superior portion of the non-round contact lens when the non-round contact lens is at its optimal final position on the eye based upon the geometry of the ocular surface;
- calculating a second surface area overlap between the upper eyelid and a superior portion of the non-round contact lens when the non-round contact lens is at its least optimal position on the eye based upon the geometry of the ocular surface;
- maximizing the difference between the first and second surface area overlaps by changing the geometric shape of the outer contour of the non-round contact lens;
- determining the geometry of a lower eyelid of at least one eye of a patient;
- calculating a third surface area overlap between the lower eyelid and an inferior portion of the non-round contact lens when the non-round contact lens is at its optimal final position on the eye based upon the geometry of the ocular surface;
- calculating a fourth surface area overlap between the lower eyelid and an inferior portion of the non-round contact lens when the non-round contact lens is at its least optimal position on the eye based upon the geometry of the ocular surface;
- and
- maximizing the difference between the third and fourth surface area overlaps by changing the geometric shape of the outer contour of the non-round contact lens.
Dependencies are inferred from the claim text.