Essilor International

Aude Carrega

Julien Hubert

Maxime Boiffier

Armel Jimenez

Franck Lestournelle

Alexandra Roos

Amélie Kudla

Catherine Derbois

Amelie Kudla

The present invention relates to an optical article comprising a substrate with a front main face and a rear main face, having a colorimetric coefficient b* as defined in the CIE (1976) L*a*b* international colorimetric system that is lower than or equal to 4, a relative light transmission factor in the visible spectrum Tv higher than or equal to 87%, and blocking at least 8% of light having a wavelength ranging from 420 to 450 nm arriving on said front main face. This optical article can be used to protect the eyes of a user from phototoxic blue light.

Optical article protecting from blue light

The invention relates to a method for determining an usage index value for an single-vision ophthalmic lens adapted to correct the vision of a myopic wearer. According to the invention the method comprises: an optical profile providing step Sduring which an optical profile of said ophthalmic lens is determined; a material profile providing step Sduring which a material profile of said ophthalmic lens is determined; a physical parameter determining step Sduring which at least one physical parameter among physical parameters of said optical profile and material profile is determined; a gain assessing step Sduring which at least two gains brought by at least one determined physical parameter is evaluated on at least one evaluation criterion of dissatisfaction of said wearer when wearing said ophthalmic lens; an usage index value determining step Sduring which a value of an usage index is determined by adding the assessed gain for the evaluation criteria.

Method for determining an usage index value for an single-vision ophthalmic lens

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Charenton-le-Pont, France

Aude Carrega