Photopigment

Photopigments are unstable pigments that undergo a chemical change when they absorb light. The term is generally applied to the non-protein chromophore moiety of photosensitive chromoproteins, such as the pigments involved in photosynthesis and photoreception. In medical terminology, "photopigment" commonly refers to the photoreceptor proteins of the retina.[1]

  1. ^ Epstein, R.J. (2003). Human Molecular Biology: An Introduction to the Molecular Basis of Health and Disease. Cambridge University Press. p. 453.