Definition: Adjective: (1) ~ field: at the edge or boundary of the field of an optical system. (2) ~ vision: visual sensations arising from stimulation of the retina 5< or more away from the fovea. * Peripheral vision is good at picking up motion but not detail or colour. (3) Noun: peripheral unit: device externally connected to a computer and under its direct control. * Formerly used to distinguish the central processor unit (now loosely called the 'computer') from the components attached to it. * Now generally refers to any equipment such as printers, monitors, scanners, modems connected to the computer and not part of the network.

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