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residual vision

1. usable vision in an individual with congenital or acquired visual impairment. For example, an individual with impaired vision in the peripheral visual field due to glaucoma may still have residual vision in the central visual field. See also low vision.

2. nonconscious visual processes that are spared when damage to the striate cortex (primary visual cortex) produces loss of vision. See blindsight.

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Psychology term of the day

May 3rd 2024

optic flow

optic flow

in the retinal image of the eye, the pattern and velocity of observed visual information about the motion of objects in an external scene relative to the motion of the observer. Optical flow patterns play an important role in locomotion; in the orientation, coordination, and balance of the body moving in space, and in the perception of movement in the outside environment. Also called optical flow. See also ecological perception. [first investigated by James J. Gibson]