Your ability to detect the presence of an object, or to differentiate among multiple objects, depends on your sensitivity to various attributes of the object.
Color – The chromatic composition of objects may be the determining factor in your ability to see and identify them.
Contrast – The magnitude of differences between light and dark, or between colors, within an object contributes to its visibility and identity.
Acuity – Your ability to detect small features is a key aspect of visual performance.