Method for determination of a pair of progressive ophthalmic lenses
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsClaude Pedrono, Bérangère Granger-Donetti
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Abstract
The invention relates to the determination of a pair of ophthalmic lenses, by measurement of the sagittal plane shift of the wearer for close vision with relation to the standard sagittal plane. Optimisation targets are then chosen as a function of the measured shift. The lenses are determined by optimisation with the chosen targets. Lenses are thus obtained with which the field of close vision is symmetrical with relation to the medial line as perceived by the wearer. A wearer with a displaced sagittal plane thus has a greater close vision field which facilitates binocular vision and increases acuity.
Claims10
Method for the determination of a pair of ophthalmic lenses for a wearer, comprising:
- measuring a shift in near vision of the wearer's sagittal plane, relative to a standard sagittal plane;
- choosing, as a function of the shift measured, target values for an optimization using optical calculation under wearing conditions;
- determining the pair of lenses by optimization using optical calculation under wearing conditions, using the chosen target values.
A pair of progressive multifocal ophthalmic lenses, each lens comprising:
- a far-vision zone;
- a near-vision zone;
- an
- marks for the angularly locating of the lens and for locating a reference point of the near-vision zone, wherein
- for locating a reference point of the near-vision zone on the lens intended for a right eye and the mark for locating a reference point of the near-vision zone on the lens intended for a left eye are in dissymmetrical positions.
Dependencies are inferred from the claim text.