Definition of retinas Retinas

ret•i•nas

We found 3 definitions of retinas from 2 different sources.

What does retinas mean?

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Noun Plural: retinas
retina - the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
		tissue layer, membrane a thin pliable sheet of material
		oculus, optic, eye a small hole or loop (as in a needle); "the thread wouldn't go through the eye"
		neuroepithelium epithelium associated with special sense organs and containing sensory nerve endings
		fovea, fovea centralis area consisting of a small depression in the retina containing cones and where vision is most acute
		parafovea area of the retina immediately surrounding the fovea
		macula lutea, macular area, yellow spot, macula any of several fungous or viral diseases characterized by yellow spotting on the leaves
		visual cell one of the cells of the retina that is sensitive to light
		optic disc, optic disk, blind spot the point where the optic nerve enters the retina; not sensitive to light
		cone cell, retinal cone, cone any cone-shaped artifact

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retina (Noun)
The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.

retina (n.)
The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye.

retina
The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.
retina
The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.

The retina is the thin layer of cells that lines the back of the eyeball in humans and in many animals. It is made mainly of neurons and its role is to sense the light which gets into the eye and send information about it to the brain.

The information about light is for two different purposes, and it takes two different paths. Information about light which travels through the optic nerve is for sight. Information about light which travels through the "retino-hypothamalic tract" is for adjusting circadian rhythms to the 24-hour day.