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photoreception pho·to·re·cep·tion (fō'tō-rĭ-sěp'shən)
The detection, absorption, and use of light, as for vision in animals or phototropism and photosynthesis in plants.
any of the biological responses of organisms to stimulation by light. Most organisms, including humans, respond to visible light; some react to wavelengths of light not seen by humans; and still others can react to properties of light not detectable by humans, such as polarization (vibration of light waves in a definite pattern). This article is concerned with the sensory processes by which animals detect information carried by light.