Translating presbyopic contact lens
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsJeffrey H. Roffman, Philippe F. Jubin, Edgar V. Menezes, Pierre-Yves Gerligand, Timothy A. Clutterbuck, Khaled A. Chehab
Life of this patent
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Abstract
Lenses for correcting presbyopia are translating, multifocal contact lenses with pseudotruncations which are asymmetric about the vertical meridian.
Claims6
A translating presbyopia contact lens comprising an optical zone, a lenticular portion surrounding the optical zone, a bevel portion surrounding the lenticular portion out to an edge of the contact lens and a pseudotruncation which is asymmetric about the vertical meridian, where the optical zone meets the lenticular portion is an optical lenticular junction and where the lenticular portion meets the bevel portion is a lenticular bevel junction;
- wherein the design of the lens surface is obtained from by the following equation:
- T3=T1+(T2−T1)*(Sin((P3−P1)/(P2−P1)*90))n
- wherein P1 is the distance from the lens center to the optical lenticular junction and T1 is the thickness at optical lenticular junction, P2 is the distance from the lens center to the lenticular bevel junction, and T2 is the thickness at the lenticular junction, P3 is an arbitrary point in the contact lens between and including P1 and P2 and T3 is the thickness at P3 to be determined.
Dependencies are inferred from the claim text.