An optical touch-control includes: four light-guide modules cooperating to define a touch-control zone, each of the light-guide modules including a light-guide strip that has a light-entry surface oriented toward a respective one of first and second ones of corners defined by the light-guide modules, and a light-exit surface that is oriented toward the touch-control zone; two light-emitting modules disposed in the first one of the corners and two light-emitting modules disposed in the second one of the corners, each of the light-emitting modules being oriented toward the light-entry surface of a corresponding one of the light-guide modules, light that enters each of the light-guide modules via the light-entry surface thereof exiting from the light-guide module via the light-exit surface thereof; and three image acquisition modules disposed respectively in the first and second ones of the corners and a remaining one of the corners, and oriented toward the touch-control zone.