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    Contrast Sensitivity Tester
    1.
    发明专利
    Contrast Sensitivity Tester 未知

    公开(公告)号：CA2131920A1

    公开(公告)日：1995-01-14

    申请号：CA2131920

    申请日：1994-06-13

    Applicant: LEICA INC

    Inventor： LUCE DAVID A ,  GROLMAN BERNARD

    IPC: A61B3/028 ,  A61B3/032 ,  A61B3/06 ,  A61B3/09

    Abstract: A device for testing visual contrast sensitivity is disclosed whereby the contrast between a vectographically polarized test symbol and a reference background may be continuously varied by changing the direction of polarization of a polarization analyzer situated along the test axis. The invention is practiced by providing a chart projector or a conventional refractor with a rotatable analyzer.

    2.
    发明专利
    未知

    公开(公告)号：MX9301373A

    公开(公告)日：1994-08-31

    申请号：MX9301373

    申请日：1993-03-12

    Applicant: LEICA INC

    Inventor： PERCIVAL CHRISTOPHER J ,  LUCE DAVID A

    IPC: G01M11/02 ,  G02B15/00

    Abstract: Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

    JOYSTICK
    3.
    发明专利
    JOYSTICK 未知

    公开(公告)号：CA2201759C

    公开(公告)日：2000-12-12

    申请号：CA2201759

    申请日：1995-10-13

    Applicant: LEICA INC

    Inventor： LUCE DAVID A ,  ZELVIN JOSEPH L

    IPC: G05G9/047 ,  A61B3/00 ,  A61B3/10 ,  G06F3/033

    Abstract: The disclosure relates to a joystick (24) for positioning a test axis of an ophthalmic instrument relative to an eye of a patient. In a preferred embodiment, the joystick (24) includes an actuator (30) extending therefrom and arranged to alternately engage a pair of motor control switches (28a and 28b) incident to slight rotation of the joystick handle (31) in opposite directions, thereby activating a motor drive to raise and lower the test axis.

    4.
    发明专利
    未知

    公开(公告)号：ES2117128T3

    公开(公告)日：1998-08-01

    申请号：ES93906486

    申请日：1993-03-05

    Applicant: LEICA INC

    Inventor： PERCIVAL CHRISTOPHER J ,  LUCE DAVID A

    IPC: G01M11/02

    Abstract: Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

    5.
    发明专利
    未知

    公开(公告)号：AT166456T

    公开(公告)日：1998-06-15

    申请号：AT93906486

    申请日：1993-03-05

    Applicant: LEICA INC

    Inventor： PERCIVAL CHRISTOPHER J ,  LUCE DAVID A

    IPC: G01M11/02

    Abstract: Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

    7.
    发明专利
    未知

    公开(公告)号：ES2095774T3

    公开(公告)日：1997-02-16

    申请号：ES94919449

    申请日：1994-06-13

    Applicant: LEICA INC

    Inventor： LUCE DAVID A ,  GROLMAN BERNARD

    IPC: A61B3/028 ,  A61B3/032 ,  A61B3/06 ,  A61B3/09 ,  A61B3/02

    Abstract: A device for testing visual contrast sensitivity is disclosed whereby the contrast between a vectographically polarized test symbol and a reference background may be continuously varied by changing the direction of polarization of a polarization analyzer situated along the test axis. The invention is practiced by providing a chart projector or a conventional refractor with a rotatable analyzer.

    JOYSTICK OVERRIDE CONTROL
    10.
    发明专利
    JOYSTICK OVERRIDE CONTROL 未知

    公开(公告)号：CA2201761C

    公开(公告)日：2000-12-12

    申请号：CA2201761

    申请日：1995-10-13

    Applicant: LEICA INC

    Inventor： LUCE DAVID A ,  MILLER DONALD E

    IPC: A61B3/10

    Abstract: An alignment override control for effecting automatic vertical alignment of a test axis of an ophthalmic instrument (10) with the center of an eye is disclosed. The test axis is associated with optical alignment means of the instrument vertically movable by an elevation motor controlled by a motor drive. A joystick (24) and a pair of directional switches (28a, 28b) are connected to the motor drive for manual positioning of the test axis. When the eye comes within a field of view defined by the optical means, the override control disconnects the switches and automatically signals the elevation motor to effect automatic alignment using signal information originating from the optical means.

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