Vision Tests.

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Presentation transcript:

Vision Tests

Panoramic vs. Binocular Vision Can’t see Bad depth perception Good depth perception Can’t see Right Left Right Left Overlap (binocular vision) Overlap

Visual Acuity Test for sharpness of vision Uses a Snellen eye chart Normal is 20/20 The numerator (top #) is the distance at which the person performing the test can see The denominator (bottom #) is the distance at which the average person can see the same line.

Astigmatism Test Test for irregular shaped cornea or lens Uses an astigmatism chart Look at center of chart If some lines appear blurred you have an astigmatism

Color-Blindness Test for nonfunctioning cones Generally involves picking colors or numbers out of a complex colored picture What number do you see?

Blind-Spot Mapping Everyone has a blind-spot Is the part of the eye where the optic disc is located. Test for diseases of the retina that can cause photoreceptors to stop working and enlarge or create additional blind spots.