Contrast sensation

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Contrast sensation is a human ability to distinguish objects which scarcely stand out against a background. Contrast sensation is evaluated on the basis of sinusoidal grids.^{[citation needed]} The increased threshold of contrast sensation may be a symptom of various eye diseases.

[edit] Example

Online investigation of contrast sensation aimed at diagnosing cornea edema caused by excessively long contact lens wear, test for a possibility of contact lens continuous wear.