Contact or intraocular lens and method for its preparation
First Claim
1. Contact or intraocular lens comprising a correcting portion (5) in order to correct the vision of a possibly myopic or hyperopic and/or possibly presbyopic astigmatic eye, comprising an optical axis (2) and a reference meridian (8);
- characterized in that it introduces, for correction of only the astigmatism, an optical path varying as a function of the distance (h) with regard to the optical axis (2) and as a function of the angular separation (θ
) with regard to the reference meridian (8), at least when this distance is between 0.4 mm and 2.4 mm, according to the following equation;
5 Assignments
0 Petitions
Accused Products
Abstract
Toric contact or intraocular lenses having a correcting portion characterized by one or more novel constructions that each produce an optical path that improves angular misalignment tolerance. The lens may be constructed with a “smooth atoric” aspect where the optical path through the correcting portion of the lens corrects for both astigmatism and an axisymmetric aberration other than astigmatism, there being no sudden surface discontinuity between the regions that provide the different corrections (thus, “smooth”). In another embodiment, the lens may be constructed with so-called “sectors” circumferentially arranged around the optical axis such that an optical path through the correcting portion of the lens varies as a function of the angular separation from the reference meridian plane, and the correcting portion is divided into at least two sectors having different astigmatism correction axes. In either embodiment, the correcting surface may be provided on either or both of the anterior or posterior faces of the lens, and the optical performance of the lens in case of angular displacement (the “angular misalignment tolerance”) is increased. Specifically, the angular misalignment tolerance is increased by at least 30% over a standard toric lens of the same class. Definition of the particular shape of the lens enables a mold die of that shape to be formed, or lens machining tools may be used.
-
Citations
41 Claims
-
1. Contact or intraocular lens comprising a correcting portion (5) in order to correct the vision of a possibly myopic or hyperopic and/or possibly presbyopic astigmatic eye, comprising an optical axis (2) and a reference meridian (8);
- characterized in that it introduces, for correction of only the astigmatism, an optical path varying as a function of the distance (h) with regard to the optical axis (2) and as a function of the angular separation (θ
) with regard to the reference meridian (8), at least when this distance is between 0.4 mm and 2.4 mm, according to the following equation;
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- characterized in that it introduces, for correction of only the astigmatism, an optical path varying as a function of the distance (h) with regard to the optical axis (2) and as a function of the angular separation (θ
- 25. A contact or intraocular lens comprising a portion for correcting the vision of an astigmatic eye, the lens defining an optical axis and a reference meridian line perpendicular thereto, the lens further having a generally convex anterior face and a generally concave posterior face, wherein one of the anterior or posterior faces is shaped so as to correct for astigmatism in that an optical path through the correcting portion of the lens varies as a function of the angular separation from the reference meridian line, and wherein the correcting portion is divided into at least two sectors having different astigmatism correction axes, the lens further having an angular misalignment tolerance that is increased by at least about 30% over a standard toric lens of the same class.
-
34. A contact or intraocular lens comprising a portion for correcting the vision of an astigmatic eye, the lens having anterior and posterior faces and defining an optical axis and a reference meridian line perpendicular thereto, wherein at least one of the anterior or posterior faces has an non axisymmetric shape that is not purely toric, and wherein the distribution of an optical path through the correcting portion of the lens is the sum of several optical paths that include at least:
-
an optical path that characterizes a correction of astigmatism; and
an optical path that characterizes an non axisymmetric aberration other than astigmatism, the lens further having an angular misalignment tolerance that is increased by at least about 30% over a standard toric lens of the same class. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
-
Specification