In chemistry, photoisomerization is molecular behavior in which structural change between isomers is caused by photoexcitation. Both reversible and irreversible isomerization reactions exist. However, the word `photoisomerization` usually indicates a reversible process. ==Applications== Photoisomerizable molecules are already put to practical us.....
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http://en.wikipedia.org/wiki/Photoisomerization
(from the article `eye, human`) ...the retinal has a shape called 11-cis, being somewhat folded, while on conversion to prelumirhodopsin the retinal has a straighter shape called ...
Found on
http://www.britannica.com/eb/a-z/p/60
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