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Screen Gallery  Snellen Illiterate LEA Contrast Grid IBars Fog Astigmatism Duo Chrome Animation

AT20 Visual Function Tester

The Medmont AT-20 places fast, accurate visual function test at your fingertips. A computerised instrument which is able to perform a wide range of visual assessment tasks. Utilising standard computer hardware and operating in a PC environment with new testing and display features, the AT20 is easily integrated into a modern ophthalmic or optometric practice.

The colour screen based system performs a wide range of visual assessment tasks including multiple acuity chart display, astigmatism, duo-chrome, binocular vision tests and contrast sensitivity testing. It is also able to display ocular images for patient recognition.

The hand-held control unit includes an illuminated display of the selected test, and a press button control, specifically designed to provide functional operation without complication.

AT-20 operates with standard computer hardware and display monitor, with upgrades of new developments available without fear of obsolescence and major investments in new hardware.

All of the AT20 functions are operated via a hand control unit with an illuminated display, providing information on the current test. The patient display is a standard SVGA colour monitor, which does not require special calibration. The images may be displayed in normal or inverse mode for use with a mirror. Normal viewing distance is 6m, but the AT20 can be scaled for different distances.

Major Functions

• Visual acuity measurement, providing various symbols which includes   children’s targets (LEA symbols)
•  capability to prevent chart memorisation
• Unique "staircasing" method of visual acuity measurement which is able to more accurately resolve acuity threshold than the standard letter chart. In this test, a single letter is progressively increased or decreased in size, according to an iStandard acuity charts (LogMAR format) with random characterncorrect or correct patient response. After a sequence of presentations, a final average acuity and standard deviation is calculated.
• Multiple display formats for acuity charts (single letter, single line, etc)
• New patient information images, with pictures depicting various ocular
  conditions that can be used to assist in describing a particular condition to a patient
• New contrast sensitivity measurement capability utilising a "staircasing" contrast measurement technique. Starting with a selectable character size, the contrast of the character is progressively decreased or increased, according to the patient response. Standard letter charts can also be displayed in a low contrast level.
• Astigmatism measurement
• Cross cylinder targets
• Various fixation targets, including animated targets for children
• Duochrome targets
• Gratings display
• Binocular vision tests

Highlights

• High resolution colour video display
• Wide variety of optotypes in logMAR steps
• Duochrome, binocular vision and astigmatism tests
• Animated fixation targets
• Library of ocular images

Specifications

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Last Updated: 31-August-2005 11:59
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