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EP1357830A1 - Appareil servant a tester la vue - Google Patents

Appareil servant a tester la vue

Info

Publication number
EP1357830A1
EP1357830A1 EP01920312A EP01920312A EP1357830A1 EP 1357830 A1 EP1357830 A1 EP 1357830A1 EP 01920312 A EP01920312 A EP 01920312A EP 01920312 A EP01920312 A EP 01920312A EP 1357830 A1 EP1357830 A1 EP 1357830A1
Authority
EP
European Patent Office
Prior art keywords
mirror
image
test apparatus
casing
image display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01920312A
Other languages
German (de)
English (en)
Inventor
Marino Menozzi
Christoph Zeller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Safety Products USA Inc
Original Assignee
Titmus Optical Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/US2001/003838 external-priority patent/WO2001058340A2/fr
Application filed by Titmus Optical Inc filed Critical Titmus Optical Inc
Publication of EP1357830A1 publication Critical patent/EP1357830A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
    • A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
    • A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors

Definitions

  • the present invention relates to the field of ophthalmic instruments, and more
  • the present invention is designed
  • test certain distances There is. limited variability in the test equipment based solely on the
  • vision testers that use bulbs or other light sources shining through, for instance, a
  • testing vision at different distances requires a different orientation
  • the present invention includes a vision test apparatus comprising a light
  • a viewer is connected to the casing and comprises a front lens.
  • a mirror is
  • An image display is movably mounted to the inside of the casing.
  • An auxiliary lens is movably mounted to the
  • the invention includes a vision test apparatus comprising a light
  • a viewer is connected to the casing and comprises right and left front lenses.
  • a right mirror and a left mirror are each rotatably moimted to the inside of the casing behind the
  • a right image display and a left image display are
  • each display being generally perpendicular to a line between the corresponding front lenses and
  • the vision test apparatus comprises a light occluding casing.
  • Viewing means are fixably attached to the casing.
  • Mirror means are rotatably mounted behind
  • the viewing means for reflecting images from an image display means to the viewing means.
  • a means for generating images there is also included a means for generating images, and an auxiliary lens movably mounted to the casing between the image displays means and the mirror means.
  • Figure 1 is a schematic flow chart illustrating components of a preferred embodiment of
  • FIG. 2 is perspective schematic view of a vision tester in accordance with the present
  • Figure 3 is a representative Landolt Ring image that is used in connection with a
  • Figure 4 is a schematic drawing defining symbols in a formula used to select the size of
  • Figure 5 is a schematic drawing defining symbols in a formula used to calculate the
  • Figure 6 is a front elevation view of the mirror-related components of a vision screener
  • Figure 7 is a top elevation view of the mirror-related components of a vision screener in
  • Figure 8 is a front elevation view of the auxiliary lens component and related features of a vision screener in accordance with a preferred embodiment of the present invention.
  • Figure 9 is a perspective view of a portion of the operative components of a vision
  • Figure 10 is a perspective view of the inside components of a vision screener in
  • image display 10 The image "x" then passes through an auxiliary lens 11, is reflected off of a
  • auxiliary lens are controlled by a CPU 15 that controls the positioning of the image display 10, auxiliary lens
  • the CPU 15 also controls the image "x" presented on the image display 10.
  • the vision screener displays different optotypes (and other pictures for
  • a preferred vision screener uses a separate
  • Both the auxiliary lens 11 and the image display 10 are movable
  • mirrors 12 are used to compensate for the vergence of the eyes of a test subject and to give an
  • auxiliary lenses and screens effectively reducing effects due to spherical "aberration" of the . auxiliary lenses 11.
  • Figure 2 illustrates how the preferred embodiment of a vision screener 20 is electronically
  • test results may be compiled, stored and recalled as necessary. Also,
  • a Landolt Ring as shown in Figure 3, is a conventional image that is used for far and
  • visual acuity values mean larger angles.
  • the maximum value to test is usually 1.6 or 2.0. Higher
  • the S Gap is the size of the gap of a Landolt Ring
  • the S Field is the size of the white field the Landolt Ring is displayed
  • the size of the field and the gap can be calculated using the following formulas:
  • Acuity testing requires optotypes with varying demand of acuity to be presented in several
  • Ranges of acuity usually vary between 0.1 and 1.25 (decimal
  • Viewing distances may vary in a range between a near (e.g. 0.35 m) and a far (e.g. 6m)
  • the system has the advantage of being
  • the screen on the image display therefore has to be optically
  • the pixel sizes may be varied by altering the
  • Variable pixel sizes have the advantage that
  • G' size of virtual image a distance between HI and object b distance between H2 and object
  • the displays depends on the optical setup. Because the distance between the displays is small, the
  • a motor can be used to turn a mirror as well.
  • the mirrors When trying to get the images to only one axis (to present a single image to a viewer), the mirrors should turn along a rotation point which is not accessible because it is too close to the
  • the mirrors have to be turned around a moving rotation point so that
  • a wedge or rail serves as a kind of a stop against which one edge of the
  • the shape of the rail is such to allow the mirror to fulfill the required two dimensional travel when it is tracked by the belt, which again serves both
  • a mirror assembly 60 includes a frame
  • the frame is referred to herein interchangeably.
  • the component 61 is movably connected to support bars 63.
  • the support bars 63 are anchored to the
  • the mounts 64 are fixedly connected to the
  • cogwheels 65 are rotatably mounted on the mounts 64.
  • the top of the belt 66 is connected to one of the supports 61 at
  • the other support 61 is connected to the belt 66 at anchor point 68.
  • cogwheel 65 will move the mirrors toward each other or away from each other depending on the
  • a wedge 71 is a
  • wedge 71 is preferably made a portion of the viewer 72. The specific angle of the wedge 71 will be described in detail below.
  • the relative angle position may vary depending on the specific construction of a given vision tester having different distances from an image display to a mirror.
  • the relative angle position is not limited to the specific construction of a given vision tester having different distances from an image display to a mirror.
  • the relative angle position is not limited to the specific construction of a given vision tester having different distances from an image display to a mirror.
  • the relative angle position is not limited to the specific construction of a given vision tester having different distances from an image display to a mirror.
  • the selection of the front lens is limited by several conditions. Given the fact that for the far distance test, a maximum error of 3% is typically allowed, and for the near distance test, a
  • the auxiliary lens and the screen is limited by the illumination of the screen which, in a preferred
  • auxiliary lens is therefore limited to about 30mm.
  • auxiliary lens is then about 25mm using a - 100mm auxiliary lens.
  • the distance of the display must be increased by
  • the optical axis (by about 45 degrees), the closest distance between mirror and auxiliary lens is
  • front lens is limited to about 40 mm. Assuming thickness of the auxiliary lens to be about 10
  • the auxiliary lens is used to decrease the image size.
  • the auxiliary lens is used to decrease the image size.
  • pixel size of the screen is 12 ⁇ m to 13 ⁇ m. If assuming apixel size of 12 ⁇ m and the usage of 6
  • the image seen by a person being tested by the vision screener is generated by two
  • each screen possesses two offsets to compensate for misalignment in both the x and y directions. To position the screens
  • the image displays may be mounted at
  • the belt systems if the image displays are not perpendicular to the line of sight.
  • the virtual image has no direct correspondence in the mechanics, rather it consists of the real image with the screens and the auxiliary lens both having a mechanical correspondence.
  • the beam deflection unit holds the mirrors which are used to set the vergence of the optical system and is movable. Dependent of the position, the mirror turns to the appropriate
  • Each motor serves a belt mnning through two wheels.
  • the belt forms a
  • both displays move symmetrically, i.e. towards
  • Figure 8 sets forth an illustration of how the stepper motor works in connection with, for
  • auxiliary lenses 80 are mo veably mounted to the support
  • a continuous loop belt 81 is driven by cogwheels 82 ⁇ Those cogwheels 82 are, in turn,
  • the top of the belt 81 is connected to one of the lenses 80 at
  • fixture point 86 The bottom of the belt 81 is connected to the other lens 80 at fixture point 85.
  • the support bars 84 are in rum carried by the mounts 87 and 88.
  • the inside mounts 87 prevent
  • the outside frame mounts 88 establish the
  • this belt is directly used to position the mirror sliders as
  • the light occluding casing 25 can serve itself as the platform for the
  • an image display platform 90 is shown mounted onto support bars 63.
  • the image display itself is not shown. It is fixed onto the surface of the platform 90.
  • platforms 90 are connected to belt 91 that is in turn rotated by cogwheels 93.
  • cogwheels 93 are connected to belt 91 that is in turn rotated by cogwheels 93.
  • lenses 80 are rotated by a separate belt 91 and actuated by a
  • auxiliary lenses 80 are as described in connection with Figure 8. They are
  • the mirror assemblies 60 are mounted onto the support bars 63 and are positioned through use of the mirror positioning motor 70 and as described in more
  • the assembly includes a viewer 72 that further
  • the support bars 63 are perpendicular to the line of sight between front lenses and the
  • stepper motors makes it possible to count the steps and multiply them with a known step
  • step counter can be set at 0. In the preferred embodiment this is done using infrared, reflexive
  • Optocouplers which act as end switches at the same time. Optocouplers are mounted on the baseplate and look upward. They are active as long as a lens or an image display platform or
  • mirror assembly is positioned just above them. They are used to find a calibrated position from which the steps then can be counted.
  • the end switch emits a infrared light beam, which is reflected by each moving component
  • the vision tester must also be calibrated so that the image on the different displays are
  • One method includes the use of parallel
  • the vision screener acts as part of an overall vision testing
  • This system allows for self-testing, customized testing, recordation and compilation of
  • the preferred system includes an administrating computer, one or more vision
  • the software via the administrating computer, enables an administrator to interface with
  • the software creates the vision screener's test sequence. It allows the administrator to enter a patient's identifying information and select the job standard to which the results will be compared. Additionally, custom testing may be input by the administrator. Once configured, the software
  • the vision screener takes the configuration data and guides the patient through selected
  • test patterns are presented individually to the patient. The patient indicates his/her
  • tests that can be performed by the vision screener include visual acuity, contrast sensitivity, color
  • the patient based oh the patient's individual responses also reduces variations in the results caused by administrator error or too few tests being presented.
  • a preferable testing technique used, for instance, in connection with color vision testing is a preferable testing technique used, for instance, in connection with color vision testing
  • Phenomena The Modified Binary Search (MOBS), Behavior Research Methods, Instruments &
  • Stimuli to be presented for vision testing vary within a given range defined by limits such
  • MOBS starts by presenting a stimulus in the middle of the
  • the procedure typically stops after a given amount
  • feature of target is set to value corresponding to opposite of range of actual testing (i.e.
  • test result OK boundaries are changed to reduce test range and test proceeds with
  • the vision screener is comprised of three subsystems - imaging, projection, and
  • the imaging system is used to display the test images on the image
  • the projection system processes the images.
  • the control systems drives the image and projection systems while providing the interface to the administrating computer and the patient.
  • the control system also supports the circuits for the speakers, joystick, image displays, and the
  • new software can be developed and programmed into the vision screener.
  • the vision screener can be manipulated and the
  • auxiliary lens and the image display may be displayed.
  • the auxiliary lens and the image display may be
  • That which has been described above is a compact, customizable vision testing device capable of producing and storing fast and accurate test results to a wide variety of test subjects,

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

La présente invention concerne un appareil servant à tester la vue, comprenant un boîtier d'occlusion lumineuse et un dispositif de visualisation relié au boîtier qui comprend une lentille frontale. Un miroir est monté rotatif à l'intérieur du boîtier à l'arrière de la lentille frontale. Un affichage d'image est monté de façon mobile à l'intérieur du boîtier. Une lentille auxiliaire est montée de façon mobile à l'intérieur du boîtier et en alignement entre l'affichage d'image et le miroir, une image affichée sur l'affichage d'image passant à travers la lentille auxiliaire, étant réfléchie par le miroir et passant à travers la lentille frontale.
EP01920312A 2001-02-07 2001-03-14 Appareil servant a tester la vue Withdrawn EP1357830A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
WOPCT/US01/03838 2001-02-07
PCT/US2001/003838 WO2001058340A2 (fr) 2000-02-09 2001-02-07 Appareil permettant de tester la vue
PCT/US2001/007892 WO2002062209A1 (fr) 2001-02-07 2001-03-14 Appareil servant a tester la vue

Publications (1)

Publication Number Publication Date
EP1357830A1 true EP1357830A1 (fr) 2003-11-05

Family

ID=21742316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01920312A Withdrawn EP1357830A1 (fr) 2001-02-07 2001-03-14 Appareil servant a tester la vue

Country Status (2)

Country Link
EP (1) EP1357830A1 (fr)
WO (1) WO2002062209A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0207303D0 (en) * 2002-03-28 2002-05-08 Jordan Ian Optical testing methods and apparatus
US20090153796A1 (en) * 2005-09-02 2009-06-18 Arthur Rabner Multi-functional optometric-ophthalmic system for testing diagnosing, or treating, vision or eyes of a subject, and methodologies thereof

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936163A (en) * 1973-09-10 1976-02-03 Gilber B. Razran Vision examination lens system
JPS6043133B2 (ja) * 1977-04-20 1985-09-26 東京光学機械株式会社 自動検眼装置
CH646322A5 (de) * 1979-10-05 1984-11-30 Reiner Josef Geraet zur subjektiven refraktionsbestimmung.
EP0144488A3 (fr) * 1980-08-11 1985-07-10 BAUSCH & LOMB INCORPORATED Support pour le positionnement des oculaires d'un réfractomètre
US4740072A (en) 1986-01-29 1988-04-26 Titmus Optical, Inc. Vision testing apparatus
DE4036964A1 (de) * 1990-11-20 1992-05-21 Rodenstock Instr Vorrichtung zur untersuchung des sehvermoegens
US5483305A (en) * 1993-01-25 1996-01-09 Canon Kabushiki Kaisha Eye examining apparatus
US5825460A (en) * 1994-04-30 1998-10-20 Canon Kabushiki Kaisha Visual function measuring apparatus
US5617157A (en) * 1994-06-15 1997-04-01 Metaphase Ophthalmic Corp. Computer controlled subjective refractor
AU3271397A (en) 1996-07-01 1998-02-09 Bar-Advanced Control Systems (Mmb) Ltd. A system and method for automatic management of summoning, identifying, self-t esting and/or self-tutoring of subjects

Non-Patent Citations (1)

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Title
See references of WO02062209A1 *

Also Published As

Publication number Publication date
WO2002062209A1 (fr) 2002-08-15

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