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MAST Keystone View VS-V 1155 Instruction Manual

Standart vision screener
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Instruction Manual
Vision Screening
with the VS-V
Vision
Screener
Model #1155
www.keystoneview.com
DIVISION OF MAST CONCEPTS, INC.
1

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Summary of Contents for MAST Keystone View VS-V 1155

  • Page 1 Instruction Manual Vision Screening with the VS-V Vision Screener Model #1155 www.keystoneview.com DIVISION OF MAST CONCEPTS, INC.

  • Page 2: Table Of Contents

    Contents VS-V: Features and Capabilities........……...3 Instrument Guide.

  • Page 3: Vs-V: Features And Capabilities

    Introduction The VS-V: Features And Capabilities The VS-V blends technological convenience with more than 80 years of vision testing research, expertise and excellence. Like its predecessors, the VS-V features several unique competitive advantages such as testing in reflected light rather than with backlit targets to mirror everyday visual function.

  • Page 4: Instrument Guide

    Instrument Guide The VS-V is designed for standardized and confidential testing. Targets are enclosed in the unit so subjects cannot see or study them in advance. Internal target illumination ensures consistency of operating conditions, and the unit pivots through a 63-degree arc to adjust to the eye level of any subject.

  • Page 5: Control Unit

    A convenient storage area, accessible from the rear, is built into the base of the instrument. The instruction man- ual and extra record forms may be stored here when the Keystone VS-V 63º is not in use. Accessible on the rear panel of the Keystone VS-V are: - The main power switch “on/off”.

  • Page 6: The Tests

    The Test Positive occlusion The VS-V incorporates a unique system for occluding (blocking out) the stereoscopic test target image seen by either eye. Each side of the test target is illuminated by a separate lamp. Occlusion of the desired eye is accomplished quickly and effectively by turning off the appropriate lamp using the Visionary Software or control panel.

  • Page 7: The Record Form

    The Record Form Note: Use of the record form is not necessary with the Soft- ware program. The VS-V Record Form (at right) makes record keeping easy: The examiner needs only to check the test subject's responses to provide a detailed record of his/her visual abilities.

  • Page 8: Test Administration

    Test subject's posture Corrective lenses Good body posture is important to good vision. Proper posture If the subject wears corrective lenses (eyeglasses or contact maintained during testing is vital. An uncomfortable position will lenses) the tests should be conducted with the lenses worn as cause strain and distract the test subject.
  • Page 9 Test Procedure: Stereoscopic Tests The test subject should sit or stand in front of the VS-V instrument, observing the rules of posture on page 9. Administer the tests with glasses worn by the subject as usual. Far Point Tests Set the test distance to far by selecting the corresponding button on the control panel. Note: Software users please disregard hand control directions.
  • Page 10 Test F-4: Night Binocular Acuity For this test, set the vision screener illumination to night position by pressing the day/night button on your hand control. Question: “Here you see three columns. Please read me the numbers in the first column from the left starting at the top row (Box 1-A)” Response: If the numbers in the top row are correctly identified the examinee is considered as having 20/20 binocular acuity during the night and you can move on to the Intermediate Distance Test (next column on the same target).
  • Page 11 Test F-6: Far-point Fusion Question: "How many balls do you see?" Response: The expected answer is three balls. A satis- factory answer is four balls becoming three. Recording: Check the appropriate space on the record form. Remarks: If only two balls are seen (which is highly unlikely), determine by their color whether they are seen by the right or left eye. The blue ball is presented to the left eye only.
  • Page 12 Near Point Tests While the test subject is still looking at the color vision target, move the distance selector switch to Near. (The "Near" indicator lamp will light.) Explain to the subject you will now check his/her visual skills at the optical equivalent of normal reading distance and he/she must look through a slightly different set of lenses.

  • Page 13: Interpreting Test Results

    Interpretations of Test Scores In general, the results of the VS-V screening tests should not be Near (N-4) considered separately, but as a whole. Taken in entirety, results Phoria, Vertical: Not more than 4 prism diopters esopho- will almost always provide a reliable indication of the test subject’s ria or 6 prism diopters exophoria visual efficiency.

  • Page 14: Routine Maintenance

    Routine Maintenance Under normal use conditions, the VS-V instrument requires minimum attention if it is protected by the dust cover when not in use. Virtually no repair or adjustment is needed, since all operating components are protected and solid-state circuitry assures exception- ally high reliability.

  • Page 15: Detailed Explanation Of Stereo Vision

    Detailed Explanation of Stereo Vision Two Eyes = Two Separate Views The eyes of a human are positioned side-by-side. Each eye views the same objects or scenery from a slightly different angle. The two views have much in common, but each eye picks up visual information the other does not. Two Eyes = Three Dimensions (3D) Each eye captures its own view and the two separate images are sent to the brain for processing.

  • Page 16: Vision Terms Glossary

    Vision Terms Glossary Accommodation: The power to adjust convergence - occurs when the two eyes Orthophoria: Expected position of eyes the focus of the eyes for seeing objects do not aim simultaneously at the same in relation to each other. distinctly at different distances.
  • Page 17 For use with Model 1155 Keystone VS-V Record Form (Standard Targets) VS-V Screeners Name _________________________________________________________________ Date ___________________________ Occupation _____________________________________________________________ Age ___________________________ Does the examinee wear Glasses or Contacts (If yes, how often?) Always Sometimes What kind of Vision Correction? Distance Only Reading Multifocals 1.
  • Page 18 FAR VISION TESTS --- Return to FAR on Elliptech Hand Control TEST DESCRIPTION AND KEY ACCEPTABLE UNACCEPTABLE RETEST (Corresponds to Remote Control Key) See Standards Guide (1) PHORIA (EYE COORDINATION) Red—Lateral • • • • • • • • • LEFT RIGHT H.
  • Page 19 SNELLEN EQUIVALENTS NEAR VISION EQUIVALENTS 20/20 = N.4 / J.1 20/20 = 6/6 20/25 = N.5 / J.2 20/25 = 6/7.5 20/30 = N.6 / J.4 20/30 = 6/9 20/40 = N.8 / J.6 20/40 = 6/12 20/50 = N.10 / J.8 20/50 = 6/15 20/60 = N.12 / J.10 20/60 = 6/18...

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