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US 2006/0050236 A1Published application
Short corridor progressive addition lenses with reduced unwanted astigmatism
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorEdgar Menezes
Life of this patent
Estimating the term…
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.
Claims35
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 first 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 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.
4 more elements
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 first 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 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.
4 more elements
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 first 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 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.
4 more elements
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 first 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 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.
4 more elements
A mark for a spectacle lens, comprising of:
- a) a location mark for measuring a distance power;
- b) a location mark for measuring a near power;
- c) a location mark for measuring a prism power;
- and d) a linear mark of at least about 1 mm in length along which a fitting point may be located.
1 more element
A progressive lens, comprising a corridor having a length of less than about 12 mm and a maximum unwanted astigmatism of less than about 80% of a total add power of the lens.
Dependencies are inferred from the claim text.