Contrast Sensitivity Tests

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OCULUS Binoptometer® 4P

OCULUS, Inc.

Features:
- Visual Acuity Test -
  With Landolt rings (in acc. with DIN EN ISO 8596), numbers, letters, tumbling E and acuity symbols for children (optional).
  New: Now also ETDRS Charts are available for the visual acuity test.
- Color Vision Test -
  Large selection of color plates according to Ishihara and Velhagen-Broschmann colour test plates. The display is calibrated to the exact color temperature, thus guaranteeing ideal color rendering.
- Binocular Test -
  The binocular vision tests are generated by a modern LCD shutter system, which is very similar to natural visual conditions. Furthermore, a variety of stereo-vision and phoria tests guarantees a reliable evaluation of the binocular vision functions.
- Contrast Sensitivity Test -
  A program for testing contrast sensitivity under photopic conditions is also integrated. The contrast sensitivity test can be conducted at various visual acuity levels with Landolt rings, letters and numerals as options.
- Mesopic Vision and Glare Sensitivity -
  Visual performance varies in different light conditions.
  To test visual function under mesopic conditions, a Landolt ring is presented in an environment of low light density (0.032 cd/m²), corresponding to the situation of night driving. The Landolt ring (visual acuity level 20/200) is presented in four different contrast stages (1:23 / 1:5 / 1:2.7 / 1:2). Glare sensitivity is tested by simulating the dimmed light of an approaching vehicle. The test with this glare light is also conducted in the four contrast stages.
  New: Due to additional corrective lenses in the range of -0,5 D to -3,5 D the possibility to check night myopia is now available.
- Peripheral Visual Field Test -
  The visual field is tested at seven visual field locations at the right and at the left. Fixation control is done by means of a changing fixation mark in the center of the test screen.
- Additional Corrective Lenses -
  If asthenopic symptoms are present or if the visual acuity values are abnormal, the additional corrective lenses in the range of +4,5 D to -3,5 D can be used to determine whether an undetected (latent) hyperopia (up to +1,5 D), an age-related long sightedness (presbyopia) or myopia, especially night myopia, exist.
- Range of Accommodation Measurement -
  Measurement of the range of accommodation can be a valuable tool for deciding whether special eyeglasses for computer users are needed. The Duane test figure makes a speedy and informative measurement possible.
- Optotypes for Children -
  In addition to the tumbling-E test, additional optotypes for testing the visual acuity of children have been added. These are based on the H-test optotypes.