Limited echelette lens, systems and methods
First Claim
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1. An ophthalmic lens, comprising:
- an anterior face and a posterior face, the faces disposed about an optical axis;
at least one diffractive profile imposed on the anterior face or the posterior face, the at least one diffractive profile consisting of an inner echelette and from 1 to 4 peripheral echelettes, wherein the inner echelette and the 1 to 4 peripheral echelettes each comprises a parabolic optical zone; and
a refractive region between an innermost one of the peripheral echelettes and the inner echelette, wherein the peripheral echelettes are not separated by a refractive region.
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Abstract
An ophthalmic lens with a circular surface structure and limited adjacent echelettes that provides enhanced image quality across an extended range of foci.
245 Citations
9 Claims
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1. An ophthalmic lens, comprising:
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an anterior face and a posterior face, the faces disposed about an optical axis; at least one diffractive profile imposed on the anterior face or the posterior face, the at least one diffractive profile consisting of an inner echelette and from 1 to 4 peripheral echelettes, wherein the inner echelette and the 1 to 4 peripheral echelettes each comprises a parabolic optical zone; and a refractive region between an innermost one of the peripheral echelettes and the inner echelette, wherein the peripheral echelettes are not separated by a refractive region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification