Intra-ocular lens or contact lens exhibiting large depth of focus
First Claim
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1. A lens zone exhibiting a depth of focus comprising a refractive power profile configured such that said depth of focus is at least 1.1 diopters for light of 550 nm wavelength, and wherein the area of said lens zone is at least 3.14 mm2.
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Abstract
Circular and annular lens zones are disclosed which, at a given lens area, exhibit a depth of focus of a lens of considerably smaller area. The large depth of focus is achieved by imparting the lens zones a refractive power profile. An assembly of such large depth of focus lens zones represents a lens of large diameter which lens, in polychromatic light, exhibits essentially the same depth of focus as the lens zones from which it is composed.
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Citations
25 Claims
- 1. A lens zone exhibiting a depth of focus comprising a refractive power profile configured such that said depth of focus is at least 1.1 diopters for light of 550 nm wavelength, and wherein the area of said lens zone is at least 3.14 mm2.
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7. A lens exhibiting a large depth of focus comprising:
at least two lens zones each lens zone having a refractive power profile wherein the depth of focus is at least 1.1 diopters for light of 550 nm wavelength and further wherein the area of each of said lens zones is at least 3.14 mm2, and wherein optical path length differences are provided between adjacent lens zones such that light rays passing through adjacent lens zones have optical path lengths between an object point and an image point which are different by at least a coherence length of light, which is at least 1 μ
m.- View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A lens exhibiting a depth of focus comprising:
at least two lens zones including a central circular lens zone and at least one annular lens zone surrounding the central circular lens zone, all lens zones configured such that light rays passing through adjacent lens zones have an optical path length between an object point and an image point which are different by at least a coherence length of light, passing through which is at least 1 μ
m, wherein the area of any of said lens zones is at least 3.14 mm2 and wherein the lens zones are given refractive power profiles such that the depth of focus of any of the lens zones is at least 1.1 diopters for light of 550 nm wavelength.- View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
Specification