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Contrast sensitivity

The ability to detect sharp boundaries (stimuli) and to detect slight changes in luminance at regions without distinct contours. Psychophysical measurements of this visual function are used to evaluate visual acuity and to detect eye disease.

Pronunciation
/kənˈtræst ˌsɛnsəˈtɪvədi/
/ˈkɒntrɑːst sɛnsɪˈtɪvɪti/