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entoptic

adj. originating within the eyeball itself. The term is used particularly to denote visual sensations caused by stimulation within the eye (entoptic phenomena), the classic example of which is seeing faint dark specks moving through the visual field when gazing at a clear, blue sky. These are shadows caused by blood cells moving through the vasculature on the surface of the retina.

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Psychology term of the day

February 26th 2024

deuteranopia

deuteranopia

n. red–green color blindness in which the deficiency is due to absence of the cone photopigment sensitive to green light, resulting in loss of green sensitivity and confusion between red and green (see dichromatism). The condition may be unilateral (i.e., color vision may be normal in one eye). See also protanopia.