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45 records (took 0.034 seconds)

    31.
    发明专利
    未知

    公开(公告)号：BR9711399A

    公开(公告)日：1999-08-17

    申请号：BR9711399

    申请日：1997-09-09

    Applicant: ESSILOR INT

    Inventor： BAUDART THIERRY ,  BOUNDONCLE BERNARD ,  PEDRONO CLAUDE ,  ROSSIER CLAIRE ,  LALOUX THIERRY

    IPC: G02C7/06 ,  G02C7/02

    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.

    MULTIFOCAL OPHTHALMIC LENS
    32.
    发明专利
    MULTIFOCAL OPHTHALMIC LENS 未知

    公开(公告)号：CA2250568A1

    公开(公告)日：1999-04-16

    申请号：CA2250568

    申请日：1998-10-15

    Applicant: ESSILOR INT

    Inventor： MIEGE CHRISTIAN ,  BAUDART THIERRY ,  AHSBAHS FRANCOISE

    IPC: G02C7/06 ,  G02B3/10 ,  G02C7/02

    Abstract: 19 In a multifocal ophthalmic lens comprising an aspherical surface having at every point thereon a mean sphere and a cylinder, a far vision region, a near vision region, and an intermediate vision region, the length of progression i.e. the length over which lens power varies by a set amount in different regions of the lens, is short. To avoid distortion at the periphery of the lens which this would otherwise occasion, the isosphere and isocylinder lines are distributed over the surface of the lens so as to ensure variations in sphere are not too sudden along a 20 mm radius circle centered on the geometric center of the lens and variations in cylinder on the surface of the lens inside this circle are also very small. The lens has an enlarged near vision region and progression is less perceptible to the wearer.

    SET OF PROGRESSIVE MULTIFOCAL OPHTHALMIC LENSES
    33.
    发明专利
    SET OF PROGRESSIVE MULTIFOCAL OPHTHALMIC LENSES 未知

    公开(公告)号：CA2265705A1

    公开(公告)日：1998-03-26

    申请号：CA2265705

    申请日：1997-09-09

    Applicant: ESSILOR INT

    Inventor： BAUDART THIERRY ,  LALOUX THIERRY ,  BOURDONCLE BERNARD ,  PEDRONO CLAUDE ,  ROSSIER CLAIRE

    IPC: G02C7/06 ,  G02C7/02

    Abstract: The invention concerns a set of progressive multifocal ophthalmic 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.

    PROGRESSIVE MULTIFOCAL OPHTHALMIC LENS
    34.
    发明专利
    PROGRESSIVE MULTIFOCAL OPHTHALMIC LENS 未知

    公开(公告)号：CA2174398A1

    公开(公告)日：1996-10-22

    申请号：CA2174398

    申请日：1996-04-17

    Applicant: ESSILOR INT

    Inventor： AHSBAHS FRANCOISE ,  BAUDART THIERRY ,  LE SAUX GILLES

    IPC: G02C7/06 ,  G02C7/02

    Abstract: In a progressive multifocal ophthalmic lens providing excellent performance in the far vision region, good width of the near vision region and gentle progression in the intermediate vision region therebetween, the far vision region comprises an angular sector defined by two half-lines that intersect at the geometrical center of the lens forming an upwardly-directed angular segment with an included angle of preferably more than 145.degree. in which all points have a cylinder less than A/2 diopters, and constraints are applied governing the gentleness of progression in the intermediate vision region and the relative width of the near vision region.

    MULTIFOCAL OPHTHALMIC LENS
    39.
    发明专利
    MULTIFOCAL OPHTHALMIC LENS 未知

    公开(公告)号：CA2250568C

    公开(公告)日：2007-06-26

    申请号：CA2250568

    申请日：1998-10-15

    Applicant: ESSILOR INT

    Inventor： MIEGE CHRISTIAN ,  AHSBAHS FRANCOISE ,  BAUDART THIERRY

    IPC: G02C7/06 ,  G02B3/10 ,  G02C7/02

    Abstract: In a multifocal ophthalmic lens comprising an aspherical surface having at every point thereon a mean sphere and a cylinder, a far vision region, a near vision region, and an intermediate vision region, the length of progression i.e. the length over which lens power varies by a set amount in different regions of the lens, is short. To avoid distortion at the periphery of the lens which this would otherwise occasion, the isosphere and isocylinder lines are distributed over the surface of the lens so as to ensure variations in sphere are not too sudden along a 20 mm radius circle centered on the geometric center of the lens and variations in cylinder on the surface of the lens inside this circle are also very small. The lens has an enlarged near vision region and progression is less perceptible to the wearer.

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