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comment by Devac
Devac  ·  1190 days ago  ·  link  ·    ·  parent  ·  post: It's the International Trans Day of Visibility. I'm Trans. Ask Me Almost Anything

It's also a type of isomerism in chemistry. Depending on at what side of carbon chain is the functional group, it's either cis or trans. Some chemicals, like rhodopsin on your own retinal rods, change their isomerism when stimulated by light. It gets twisted in a way and as it changes from cis to all-trans it causes the molecule to squeeze due to photons and as it relaxes back it causes the further action that is crucial for sight.