Ophthalmic lens with diffractive power
First Claim
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1. An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the chromatic effect.
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Abstract
An ophthalmic lens incorporates a transmission hologram which has negative diffractive power and introduces positive longitudinal chromatic aberration to add to the natural longitudinal chromatic aberration of the human eye, thereby reducing the need to accommodate. The lens also has refractive power to balance the diffractive power or to give a desired overall or residual power.
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18 Claims
- 1. An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the chromatic effect.
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18. An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the vision of the eye at any one accomodation setting by increasing the spacing between a blue object at one distance and a red object at a greater distance whose images are sharply focused on the retina.
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