Concentric annular ring lens designs for astigmatism
First Claim
1. A multifocus, concentric annular ring lens for astigmatic patients comprising:
- a. said lens having a front surface and an opposite back surface;
b. one of the front and back surfaces defines a toric curve;
c. the other of the front and back surfaces defines a plurality of spherical concentric annular rings having at least one first spherical annular ring corresponding to the patient'"'"'s basic distance spherical prescription Rx, and at least one second spherical annular ring corresponding to the patient'"'"'s basic cylindrical prescription Rx, such that the multifocus toric lens is rotationally desensitized because of the enhanced depth-of-field provided by the plurality of concentric annular rings;
wherein the difference between the optical powers of the first and second spherical annular rings is less than 2.0 diopters.
1 Assignment
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Accused Products
Abstract
Concentric annular ring lens designs are disclosed for astigmatic patients, particularly lens designs which reduce the sensitivity of the patient to toric axis misalignment, thus reducing the required number of stock keeping units in inventory for a toric product. Several of the concentric annular ring lens designs comprise a multifocal concentric annular ring design on either the front or back surface and a toric curve on the reverse surface to correct for astigmatism. Alternating concentric annular rings divide the optical zone of the contact lens into regions having at least two optical powers, a first optical power corresponding to the refractive spherical component of a patient'"'"'s basic prescription Rx, and a second optical power corresponding to the cylindrical power of a patient'"'"'s basic prescription Rx, or a portion thereof, with an optional third intermediate optical power, such that the multifocus toric lens is rotationally desensitized because of the enhanced depth-of-field provided by the plurality of concentric annular rings. Some embodiments of the present invention have a spherical front or back surface wherein the opposite surface has a plurality of toric annular rings. Some embodiments of the present invention eliminate a toric surface, prism ballast and slab-off features, and provide spherical optical powers at the basic prescription Rx spherical power, the cylindrical power prescription Rx, and an intermediate optical power intermediate to the spherical and cylindrical optical powers.
273 Citations
43 Claims
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1. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines a toric curve; c. the other of the front and back surfaces defines a plurality of spherical concentric annular rings having at least one first spherical annular ring corresponding to the patient'"'"'s basic distance spherical prescription Rx, and at least one second spherical annular ring corresponding to the patient'"'"'s basic cylindrical prescription Rx, such that the multifocus toric lens is rotationally desensitized because of the enhanced depth-of-field provided by the plurality of concentric annular rings; wherein the difference between the optical powers of the first and second spherical annular rings is less than 2.0 diopters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines a toric curve; c. the other of the front and back surfaces defines a plurality of spherical concentric annular rings having at least one first spherical annular ring corresponding to the patient'"'"'s basic distance spherical prescription Rx, and at least one second spherical annular ring corresponding to the patient'"'"'s basic cylindrical prescription Rx, such that the multifocus toric lens is rotationally desensitized because of the enhanced depth-of-field provided by the plurality of concentric annular rings; and d. said lens further including an aspheric surface superposed on the toric curve to enhance the depth-of-field effect of the lens.
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10. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines a spherical or aspheric curve; c. the other of the front and back surfaces defines a plurality of spherical concentric annular rings having at least one first spherical annular ring corresponding to the patient'"'"'s basic distance prescription Rx, and at least one second spherical annular ring corresponding to the patient'"'"'s cylindrical prescription Rx; and d. at least one third spherical annular ring corresponding to an intermediate optical power which is between the optical powers of the first and second annular rings.
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11. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines a spherical or aspheric curve; c. the other of the front and back surfaces defines a plurality of spherical concentric annular rings having at least one first spherical annular ring corresponding to the patient'"'"'s basic distance prescription Rx, and at least one second spherical annular ring corresponding to the patient'"'"'s cylindrical prescription Rx; and wherein the difference between the optical powers of the first and second spherical annular rings is less than 2.0 diopters. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines a spherical curve; c. the other of the front and back surfaces defines a plurality of aspheric concentric annular rings having at least one first aspheric annular ring corresponding to the patient'"'"'s basic distance prescription Rx, and at least one second aspheric annular ring corresponding to the patient'"'"'s cylindrical prescription Rx; wherein the difference between optical powers of the first and second annular rings is no greater than 2.00 diopters. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines an aspheric curve; c. the other of the front and back surfaces defines a plurality of spherical concentric annular rings having at least one first spherical annular ring corresponding to the patient'"'"'s basic distance prescription Rx, and at least one second spherical annular ring corresponding to the patient'"'"'s cylindrical prescription Rx; wherein the difference between optical powers of the first and second annular rings is no greater than 2.00 diopters. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A multifocus, concentric annular ring lens for astigmatic patients comprising:
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a. said lens having a front surface and an opposite back surface; b. one of the front and back surfaces defines a spherical surface corresponding to the patient'"'"'s basic spherical distance prescription; c. the other of the front and back surfaces defines a plurality of concentric toric annular rings having at least one first toric annular ring corresponding to the patient'"'"'s basic spherical correction prescription Rx, and at least one second toric annular ring corresponding to the patient'"'"'s basic cylindrical prescription Rx. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification