Contrast sensitivity testing measures the ability to detect differences in luminance between an object and its background, which is crucial for tasks like night driving and recognizing faces. Unlike standard visual acuity tests that assess sharpness at high contrast, contrast sensitivity tests evaluate vision under varying levels of contrast, often using charts with different patterns or luminance levels. This type of testing can help diagnose and monitor conditions such as cataracts, glaucoma, and retinal disorders, where contrast perception may be compromised. Ultimately, it provides a more comprehensive understanding of functional vision beyond just sharpness.
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