Multiple layer multifocal composite lens
First Claim
1. A composite ophthalmic lens product, comprising:
- a first plastic layer comprising a first material having a first index of refraction n1;
a second plastic layer comprising a second material different from the first material and having a second index of refraction n2greater than the first index of refraction n1,wherein, the first layer is an anterior layer and the second layer is a posterior layer,the first layer is in optical communication with at least a portion of the second layer, and the first layer and the second layer are configured to contribute to a corrective optical power of an ophthalmic lens formed at least partially from the composite ophthalmic lens product,the first layer comprises a first thickness in a range of approximately 0.2mm to 1.0 mm, andn1/n2 is in a range of approximately 0.88 to 0.96.
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Accused Products
Abstract
Aspects of the present invention provide multiple-layer (multi-layer) composite lenses comprising two or more materials and methods for making the same. A multi-layer composite lens of the present invention can use multiple surfaces (internal or external) to form optical elements that can contribute to a total desired add power. The multiple contributing optical elements can be aligned so as to be in optical communication to form multiple stable vision zones to enhance optical performance and the vision experience of the wearer. Distributing the total desired add power across multiple appropriately aligned optical elements that are in optical communication with one another can reduce the total distortion of the lens, minimize the number of optical discontinuities introduced, can reduce optical power jump as experienced by the wearer'"'"'s eye when traversing any discontinuity, and can reduce the visibility of any introduced optical discontinuity as perceived by an observer looking at the wearer.
46 Citations
14 Claims
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1. A composite ophthalmic lens product, comprising:
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a first plastic layer comprising a first material having a first index of refraction n1; a second plastic layer comprising a second material different from the first material and having a second index of refraction n2greater than the first index of refraction n1, wherein, the first layer is an anterior layer and the second layer is a posterior layer, the first layer is in optical communication with at least a portion of the second layer, and the first layer and the second layer are configured to contribute to a corrective optical power of an ophthalmic lens formed at least partially from the composite ophthalmic lens product, the first layer comprises a first thickness in a range of approximately 0.2mm to 1.0 mm, and n1/n2 is in a range of approximately 0.88 to 0.96. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification