Method for the determination of a progressive ophtalmic lens
A method for the determination of a progressive ophthalmic lens for a given wearer comprises the stages of: - determining the axial length (LA) of the wearer's eye, - determining an ergorama associating a sight point with each direction of viewing under wearing conditions. - determining power a...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | A method for the determination of a progressive ophthalmic lens for a given wearer comprises the stages of:
- determining the axial length (LA) of the wearer's eye,
- determining an ergorama associating a sight point with each direction of viewing under wearing conditions.
- determining power and resulting astigmatism defect targets for each direction of viewing under wearing conditions, the targets being a function of the axial length of the wearer's eye.
- calculating the power required on the lens for each direction of viewing by successive iterations in order to obtain the target power defect and the target resulting astigmatism. |
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