Progressive addition lenses
DCFirst Claim
1. A lens comprising a first progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a first dioptric add power and second progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a second dioptric add power, the progressive addition surfaces disposed in relation to each other so that a portion or all of the areas of maximum, localized unwanted astigmatism are misaligned and wherein the dioptric add power of the lens is about the sum of the first and second dioptric add powers.
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Abstract
The invention provides progressive addition lenses in which lens unwanted astigmatism is reduced and channel width through the intermediate and near vision zones is increased as compared to conventional progressive addition lenses. This result is achieved by combining two or more progressive addition surfaces, which surfaces in combination provide the dioptric add power of the lens.
56 Citations
26 Claims
- 1. A lens comprising a first progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a first dioptric add power and second progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a second dioptric add power, the progressive addition surfaces disposed in relation to each other so that a portion or all of the areas of maximum, localized unwanted astigmatism are misaligned and wherein the dioptric add power of the lens is about the sum of the first and second dioptric add powers.
- 10. A spectacle lens comprising a first progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a first dioptric add power and second progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a second dioptric add power, the progressive addition surfaces disposed in relation to each other so that a portion or all of the areas of maximum, localized unwanted astigmatism are misaligned and wherein the dioptric add power of the lens is about the sum of the first and second dioptric add powers.
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22. A process for producing a lens comprising the steps of:
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providing at least a first and a second progressive addition surface, the first progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a first dioptric add power and the second progressive addition surface having one or more areas of maximum, localized unwanted astigmatism and a second dioptric add power, and disposing the first and second progressive addition surfaces so that all or a portion of the areas of maximum, localized unwanted astigmatism are misaligned and the dioptric add power of the lens is about the sum of the first and second dioptric add powers. - View Dependent Claims (23, 24, 25, 26)
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Specification