METHOD FOR DETERMINATION OF A PAIR OF PROGRESSIVE OPHTHALMIC LENSES

    公开(公告)号:CA2587479C

    公开(公告)日:2015-11-17

    申请号:CA2587479

    申请日:2005-08-05

    Applicant: ESSILOR INT

    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.

    35.
    发明专利
    未知

    公开(公告)号:FR2894687B1

    公开(公告)日:2008-02-15

    申请号:FR0512586

    申请日:2005-12-13

    Applicant: ESSILOR INT

    Abstract: A method for determining a progressive ophthalmic lens for a given user for whom a near vision power addition has been prescribed includes the following steps: measuring the user's downward and the vertical horopter on a near-vision target point; measuring the user's near-vision head elevation and/or eye elevation; determining a coefficient of the user's near-vision vertical head participation (Ptvvp); determining a user-specific progressive length (LP) defined by the relationship LP=H (1−Ptvyp), the progressive length being defined as the downward look angle between the mounting cross and the meridian point for which the power achieves the power addition; determining the lens by optimizing in optical computation in worn conditions, using as target a power variation along the meridian with a progressive length equal to said user-specific progressive length.

    PROCEDE DE DETERMINATION D'UNE LENTILLE OPHTALMIQUE PROGRESSIVE

    公开(公告)号:FR2894687A1

    公开(公告)日:2007-06-15

    申请号:FR0512586

    申请日:2005-12-13

    Applicant: ESSILOR INT

    Abstract: L'invention a pour objet un procédé de détermination d'une lentille ophtalmique progressive pour un porteur donné auquel une addition de puissance a été prescrite en vison de près, comprenant les étapes de :- mesure de l'abaissement du regard et d'un horoptère vertical du porteur sur un point visé en vision de près ;- mesure de l'élévation de la tête et/ou de l'élévation des yeux du porteur en vision de près ;- détermination d'un coefficient de participation vertical de la tête en vision de près (PtVvp);- détermination d'une longueur de progression (LP) spécifique au porteur définie par la relation LP= H (1- PtVvp), la longueur de progression étant définie comme l'angle d'abaissement des yeux entre la croix de montage et le point de la méridienne pour lequel la puissance atteint l'addition de puissance ;- détermination de la lentille par optimisation en calcul optique dans les conditions du porté, en utilisant comme cible une variation de puissance le long de la méridienne avec une longueur de progression égale à ladite longueur de progression spécifique au porteur.

    SET OF PROGRESSIVE MULTIFOCAL OPHTHALMIC LENSES

    公开(公告)号:CA2265705C

    公开(公告)日:2007-02-13

    申请号:CA2265705

    申请日:1997-09-09

    Applicant: ESSILOR INT

    Abstract: The invention concerns a set of progressive multifocal ophthalmic lenses, ea ch having a first progressive multifocal surface and a second surface preferabl y spherical. It proposes to define the set of lenses with regard to the optical characteristics of the lenses, and particularly wearer power and oblique astigmatism, in wor n conditions. For this purpose, the invention defines an ergorama associating with each sight direction in worn conditions a target object point, and a given power. This ergorama supplies a power target for a definition by optimisation of the lenses, and is used in a radii plotting programme for calculating the optical characteristics during optimisation. The set of lenses has substantially identical optical performances for a given addition, whatever the power of the far vision reference point.

    38.
    发明专利
    未知

    公开(公告)号:DE69714273T2

    公开(公告)日:2003-03-27

    申请号:DE69714273

    申请日:1997-09-09

    Applicant: ESSILOR INT

    Abstract: The invention concerns a set of progressive multifocal opthalmic lenses, each having a first progressive multifocal surface and a second surface preferably spherical. It proposes to define the set of lenses with regard to the optical characteristics of the lenses, and particularly wearer power and oblique astigmatism, in worn conditions. For this purpose, the invention defines an ergorama associating with each sight direction in worn conditions a target object point, and a given power. This ergorama supplies a power target for a definition by optimisation of the lenses, and is used in a radii plotting programme for calculating the optical characteristics during optimisation. The set of lenses has substantially identical optical performances for a given addition, whatever the power of the far vision reference point.

    39.
    发明专利
    未知

    公开(公告)号:DE69801476D1

    公开(公告)日:2001-10-04

    申请号:DE69801476

    申请日:1998-10-13

    Applicant: ESSILOR INT

    Abstract: The lens has an aspherical surface with a geometrical center, a reference point for near vision, and a virtually umbilical and vertical meridian line with a mean spherical and cylindrical value at each point. The area formed by points at a distance of less than 20 mm from the geometrical center and with a cylindrical value of between 0.42 and 0.84 diopter is greater than the area formed by points at a distance of less than 20 mm from the geometrical center and with a cylindrical value of less than 0.42 diopter.

    Multifocal ophthalmic lens
    40.
    发明专利

    公开(公告)号:AU739216B2

    公开(公告)日:2001-10-04

    申请号:AU8934698

    申请日:1998-10-15

    Applicant: ESSILOR INT

    Abstract: The lens has an aspherical surface (S) presenting at any point a mean sphere and cylinder, having a distance vision zone (VL), a near vision zone (VP), an intermediate vision zone (VI) and a main meridian of progression (MM') passing through all three zones. The relationship between a maximum cylinder within a circle of 20 mm radius centered on the geometrical center of the lens and the distance from the center to a point inside the circle or maximum cylinder is less than or equal to half the maximum inclination of the mean sphere on the main meridian of progression.

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