Progressive addition lenses having regressive surfaces
DCFirst Claim
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1. A lens comprising one or more progressive addition surfaces and one or more regressive surfaces.
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Abstract
The invention provides progressive lenses with reduced unwanted astigmatism obtained by combining progressive addition and regressive surfaces. The unwanted astigmatisms of the progressive and regressive surfaces act to cancel each other. Thus, the lens has reduced unwanted astigmatism compared to prior art lenses of comparable dioptric add power.
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Citations
17 Claims
- 1. A lens comprising one or more progressive addition surfaces and one or more regressive surfaces.
- 5. A spectacle lens comprising one or more progressive addition surfaces and one or more regressive surfaces, wherein the distance vision zones, near vision zones and channels of the progressive and regressive surfaces are aligned.
- 7. A spectacle lens comprising one or more progressive addition surfaces and one or more regressive surfaces, wherein one or more progressive addition surfaces are of a soft design and the one or more regressive surfaces are of a hard design.
- 9. A spectacle lens comprising a progressive addition surface and a regressive surface, wherein the distance vision zones, near vision zones and channels of the progressive and regressive surfaces are aligned.
- 11. A spectacle lens comprising a progressive addition surface and a regressive surface, wherein the progressive addition surface is of a soft design and the regressive surface is of a hard design.
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13. A method for producing a progressive addition spectacle lens comprising:
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a.) providing at least one regressive surface and at least one progressive addition surface; and b.) fabricating the progressive addition spectacle lens using the surfaces provided in step a.). - View Dependent Claims (14, 15, 16, 17)
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Specification