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Insect Vision: Ommatidium Structure and Function
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Retinal Eyes vs Compound Eyes
Retinal is also known as retinaldehyde. It was originally called retinene, and renamed after it was discovered to be vitamin A aldehyde. Retinal is one of the many forms of vitamin A. Retinal is a polyene chromophore, bound to proteins called opsins, and is the chemical basis of animal vision.
Retinal allows certain microorganisms to convert light into metabolic energy.