Simplify: 
Definitions:
Lens
A transparent structure in the eye that focuses light rays onto the retina to create clear images.
Retina
A layer of tissue at the back of the eye that senses light and sends visual signals to the brain.
Rhodopsin
Light-sensitive substance found in the rods of the retina; composed of opsin loosely bound to retinal.
Retinal
A form of vitamin A that plays a crucial role in the conversion of light into a signal that can be interpreted by the brain, leading to vision.
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