light perception; light sensation
Technical term used in physiology, ophthalmology, and sensory science to refer to the basic ability to detect light, often contrasted with form perception or color vision.
Light perception is the most basic function of vision.
In this experiment, the subjects' light sensation threshold was measured.
Compound of 光 (light) and 感覚 (sensation, perception). A straightforward technical coinage from Sino-Japanese elements.