Method for determination of an ophthalmic lens

The subject of the invention is a method for determination by optimization of an ophthalmic lens for a wearer for whom a power addition has been prescribed. The method proposes using as a target for the optimization of the lens, under wearing conditions, a difference of the mean orientation of the a...

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Bibliographic Details
Main Authors BOURDONCLE BERNARD, MARIN GILDAS
Format Patent
LanguageChinese
English
Published 24.12.2008
Subjects
CONTACT LENSES
OPTICS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
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Summary:The subject of the invention is a method for determination by optimization of an ophthalmic lens for a wearer for whom a power addition has been prescribed. The method proposes using as a target for the optimization of the lens, under wearing conditions, a difference of the mean orientation of the axes of resulting astigmatism to the vertical of less than 2.5 degrees in a first control zone delimited by an ellipse centred on the progression meridian at half height between the fitting cross and the near vision reference point, said ellipse having a major axis greater than 35 DEG and a minor axis comprised between 3.8 degrees and 4.5 degrees. The invention allows improvement in the performances of the progressive multifocal lenses in intermediate vision.
Bibliography:Application Number: CN200680047497