Examlex
Hydrogen has four naturally occurring isotopes.
Photoreceptors
Specialized cells in the retina of the eye that respond to light, enabling vision.
Optic Nerve
A cranial nerve that transmits visual information from the retina to the brain, playing a crucial role in the sense of sight.
Color Blindness
A condition where a person is unable to distinguish between certain colors, typically red and green, due to a lack of cone cells in the eye.
Red-Green Color Blindness
A common form of color vision deficiency where individuals have difficulty distinguishing between red and green hues.
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