Some conditions that affect the eyes may be related to toxic forms of the molecules that normally act to send visual signals to the brain. These molecules are retinal of the 11-cis (11-CR) and all-trans (ATR) variety. Therefore, 11-CR and ATR are technically the same compounds. However, they each take a different ‘shape’ in order to control the first steps in the transmission of light-based information to the brain.

Source: Link Between Blue Light And Retinal Toxicity Established | Evolving Science

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