photorefraction

== English == === Etymology === From photo- +‎ refraction. === Pronunciation === Rhymes: -ækʃən === Noun === photorefraction (countable and uncountable, plural photorefractions) A nonlinear optical effect seen in certain crystals and other materials that respond to light by altering their refractive index. The refraction of light, typically within the eye. ==== Related terms ==== photorefractor