retina

n. the light-sensitive inner surface of the eye. A layer of neurons lines the inner surface of the back of the eye and provides the sensory signals required for vision. The retina contains the photoreceptors—that is, the retinal rods and retinal cones—as well as additional neurons that process the signals of the photoreceptors and convey an output signal to the brain by way of the optic nerve. This inner layer of the retina is sometimes called the neural retina, to distinguish it from the retinal pigment epithelium, which abuts the tips of the photoreceptors. See also amacrine cell; retinal bipolar cell; retinal horizontal cell; retinal ganglion cell.

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Psychology term of the day

May 9th 2024

drug education

the process of informing individuals or groups about the effects of various chemical agents on the human body, usually with a special emphasis on the effects of mind-altering substances.