the physiological perception of light.
Origin of photoreception
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
The detection, absorption, and use of light, as for vision in animals or phototropism and photosynthesis in plants.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.