noun
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.
光感覚は視覚の最も基本的な機能である。
Light perception is the most basic function of vision.
この実験では被験者の光感覚の閾値を測定した。
In this experiment, the subjects' light sensation threshold was measured.
色覚 is color vision, a higher-level visual function that depends on light perception but involves discrimination of wavelengths.
Compound of 光 (light) and 感覚 (sensation, perception). A straightforward technical coinage from Sino-Japanese elements.