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    Progressive multifocal opthalmic lens
    31.
    发明专利
    Progressive multifocal opthalmic lens 未知

    公开(公告)号：GB2294553A

    公开(公告)日：1996-05-01

    申请号：GB9522051

    申请日：1995-10-27

    Applicant: ESSILOR INT

    Inventor： AHSBAHS FRANCOISE ,  PEDRONO CLAUDE

    IPC: G02C7/06 ,  G02C7/02

    Abstract: A progressive multifocal ophthalmic lens is provided having an aspherical surface with a mean sphere and a cylinder at every point. The aspherical surface has a distance vision portion, with a control point for distance vision, a near vision portion with a control point for near vision, and an intermediate vision portion between the near vision portion and the distance vision portion. A power addition value A is defined as a variation in mean sphere between the control point for distance vision and the control point for near vision portion. A base B is defined as a value of mean sphere at the control point for distance vision. A width of the near vision portion varies not only as a function of the power addition value A, but also as a function of the value B of the base. The invention thereby ensures the presence of a substantially constant object field for all values of the power addition and of the base.

    32.
    发明专利
    未知

    公开(公告)号：BR9304636A

    公开(公告)日：1994-06-21

    申请号：BR9304636

    申请日：1993-12-06

    Applicant: ESSILOR INT

    Inventor： HARSIGNY CHRISTIAN ,  MIEGE CHRISTIAN ,  CHAUVEAU JEAN-PIERRE ,  AHSBAHS FRANCOISE

    IPC: G02C7/06 ,  G02C7/02

    Abstract: A progressive multifocal ophthalmic lens is provided having an aspherical surface comprising a distance vision portion, a near vision portion and an intermediate vision portion, in which the maximum mean sphere gradient value is situated in the intermediate vision portion of the principal meridian of progression of the lens, and the cylinder gradient over the whole aspherical surface of the lens is less than the product obtained by multiplying the power addition value at each point by a constant value coefficient.

    PROGRESSIVE MULTIFOCAL OPHTHALMIC LENS WITH RAPID POWER VARIATION
    34.
    发明专利
    PROGRESSIVE MULTIFOCAL OPHTHALMIC LENS WITH RAPID POWER VARIATION 未知

    公开(公告)号：CA2436358C

    公开(公告)日：2011-07-26

    申请号：CA2436358

    申请日：2002-02-01

    Applicant: ESSILOR INT

    Inventor： AHSBAHS FRANCOISE ,  DEVIE PIERRE

    IPC: G02C7/06 ,  G02C7/02

    Abstract: The invention relates to a progressive multifocal ophthalmic lens having a far vision region, an intermediate vision region and a near vision region, a main meridian of progression passing through said three regions, and a power addition equal to a difference in mean sphere between a near vision region control point and a far vision region control point. The lens has a progression length less than 12 mm, defined as the vertical distance between a mounting center and a point on the meridian where mean sphere is greater than mean sphere at the far vision control point by 85% of the power addition value. To ensure good visual characteristics not only around the meridian, but also in regions of extra-foveal vision, the ratio between the integral of the product of cylinder times the norm of sphere gradient, on a 40 mm diameter circle centered on the center of the lens, and the product of the area of this circle, power addition and a maximum value of the norm of sphere gradient over that part of the meridian comprised within this circle is less than 0.14.

    35.
    发明专利
    未知

    公开(公告)号：AT510237T

    公开(公告)日：2011-06-15

    申请号：AT00400081

    申请日：2000-01-13

    Applicant: ESSILOR INT

    Inventor： FRANCOIS SANDRINE ,  AHSBAHS FRANCOISE

    IPC: G02C7/02 ,  G02C7/06

    Abstract: The lens has a mean sphere and a cylinder at each of points of an aspherical surface of the lens. A main progression meridian passes through far, near and intermediate vision regions. Differences between maximum cylinder values over a distance of 20 mm at both sides of the meridian have an absolute value less than or equal to 0.30 diopters. An absolute value of difference between maximum and minimum values of cylinder at each side of the meridian is less than or equal to the product of power addition and a constant having a value of 0.10. The power addition is defined as a difference in the mean sphere between a reference point (VP) of the near vision region and a reference point (VL) of the far vision region, and is greater than or equal to 2.50 diopters.

    39.
    发明专利
    未知

    公开(公告)号：DE60212058D1

    公开(公告)日：2006-07-20

    申请号：DE60212058

    申请日：2002-02-01

    Applicant: ESSILOR INT

    Inventor： AHSBAHS FRANCOISE ,  DEVIE PIERRE

    IPC: G02C7/02 ,  G02C7/06

    Abstract: A progressive multifocal ophthalmic lens having a far vision region, an intermediate vision region and a near vision region, a main meridian of progression passing through said three regions, and a power addition equal to a difference in mean sphere between a near vision region control point and a far vision region control point is provided. The lens has a progression length less than 12 mm, defined as the vertical distance between a mounting center and a point on the meridian where mean sphere is greater than mean sphere at the far vision control point by 85% of the power addition value. To ensure excellent optical performance of the lens despite this short length of progression, the ratio between the product of cylinder times the norm of sphere gradient, and the square of power addition is less than 0.08 mm-1 at every point within a 40 mm diameter disc centered on the center of the lens. Additionally, cylinder within that part of the disc situated above the mounting center is less than 0.5 times power addition.

    Progressive multifocal ophthalmic lens with fast power variation
    40.
    发明专利
    Progressive multifocal ophthalmic lens with fast power variation 未知

    公开(公告)号：AU2002234718B8

    公开(公告)日：2005-12-08

    申请号：AU2002234718

    申请日：2002-02-01

    Applicant: ESSILOR INT

    Inventor： AHSBAHS FRANCOISE ,  DEVIE PIERRE

    IPC: G02C7/06 ,  G02C7/02 ,  G02C007/02

    Abstract: A progressive multifocal ophthalmic lens having a far vision region, an intermediate vision region and a near vision region, a main meridian of progression passing through said three regions, and a power addition equal to a difference in mean sphere between a near vision region control point and a far vision region control point is provided. The lens has a progression length less than 12 mm, defined as the vertical distance between a mounting center and a point on the meridian where mean sphere is greater than mean sphere at the far vision control point by 85% of the power addition value. To ensure excellent optical performance of the lens despite this short length of progression, the ratio between the product of cylinder times the norm of sphere gradient, and the square of power addition is less than 0.08 mm-1 at every point within a 40 mm diameter disc centered on the center of the lens. Additionally, cylinder within that part of the disc situated above the mounting center is less than 0.5 times power addition.

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