Short corridor progressive addition lenses with reduced unwanted astigmatism
First Claim
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1. A method for designing a progressive addition lens, comprising the steps of:
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
b.) expressing the first surface as a first plurality of sag values;
c.) multiplying the first plurality of sag values by a first blending function;
d.) providing a second progressive addition surface having a second add power and a second corridor of a second length;
e.) expressing the second surface as a second plurality of sag values;
f.) multiplying the second plurality of sag values by a second blending function that may be the same or different from the first blending function;
g.) adding the multiplied first and second plurality of sag values to produce a third progressive surface having the first add power, a third corridor wherein a length of the third corridor is at least about 1 mm less than the first and second corridor lengths.
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Abstract
The invention provides lenses produced by the adding of two or more surfaces, in which lenses both the length of the corridor is shortened and the maximum unwanted astigmatism is reduced.
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Citations
32 Claims
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1. A method for designing a progressive addition lens, comprising the steps of:
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
b.) expressing the first surface as a first plurality of sag values;
c.) multiplying the first plurality of sag values by a first blending function;
d.) providing a second progressive addition surface having a second add power and a second corridor of a second length;
e.) expressing the second surface as a second plurality of sag values;
f.) multiplying the second plurality of sag values by a second blending function that may be the same or different from the first blending function;
g.) adding the multiplied first and second plurality of sag values to produce a third progressive surface having the first add power, a third corridor wherein a length of the third corridor is at least about 1 mm less than the first and second corridor lengths. - View Dependent Claims (2, 9, 13, 17, 21, 25, 29)
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
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3. A method for designing a progressive addition lens, comprising the steps of:
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
b.) expressing the first surface as a first plurality of sag values;
c.) multiplying the first plurality of sag values by a first blending function;
d.) providing a second progressive addition surface having a second add power and a second corridor of a second length;
e.) expressing the second surface as a second plurality of sag values;
f.) multiplying the second plurality of sag values by a second blending function that may be the same or different from the first blending function;
g.) blending radially the multiplied first and second plurality of sag values to produce a third progressive surface having the first add power, a third corridor wherein a length of the third corridor is at least about 1 mm less than the first and second corridor lengths. - View Dependent Claims (4, 10, 14, 18, 22, 26, 30)
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
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5. A method for designing a progressive addition lens, comprising the steps of:
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
b.) expressing the first surface as a first plurality of sag values;
c.) multiplying the first plurality of sag values by a first blending function;
d.) providing a second progressive addition surface having a second add power and a second corridor of a second length;
e.) expressing the second surface as a second plurality of sag values;
f.) multiplying the second plurality of sag values by a second blending function that may be the same or different from the first blending function;
g.) adding the multiplied first and second plurality of sag values to produce a third progressive surface having the first add power, a third corridor wherein a length of the third corridor is at least about 1 mm less than one of the first and second corridor lengths. - View Dependent Claims (6, 11, 15, 19, 23, 27, 31)
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
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7. A method for designing a progressive addition lens, comprising the steps of:
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
b.) expressing the first surface as a first plurality of sag values;
c.) multiplying the first plurality of sag values by a first blending function;
d.) providing a second progressive addition surface having a second add power and a second corridor of a second length;
e.) expressing the second surface as a second plurality of sag values;
f.) multiplying the second plurality of sag values by a second blending function that may be the same or different from the first blending function;
g.) blending radially the multiplied first and second plurality of sag values to produce a third progressive surface having the first add power, a third corridor wherein a length of the third corridor is at least about 1 mm less than one of the first and second corridor lengths. - View Dependent Claims (8, 12, 16, 20, 24, 28, 32)
- a.) providing a first progressive addition surface having a first add power and a first corridor of a first length;
Specification