Contrast sensitivity testing is used to assess the quality of one's vision under "real-world" circumstances as opposed to the standard visual acuity testing, which measures eyesight under ideal conditions.
How its performed:
The contrast sensitivity test is done by displaying a series of stripes or bars that slant in different directions. The patient indicates which way the stripes are angled. As the test progresses, the stripes or bars become thinner and fainter.
The test gives the doctor a much more complete picture of your vision and is particularly useful for patients who see well on a conventional eye chart but still seem to have visual difficulties.