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Retina - Dictionary Definition and Overview |
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Retina : (noun)
1: the light-sensitive membrane covering the back wall of the
eyeball; it is continuous with the optic nerve
Based on WordNet 2.0
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Retina : \Ret"i*na\, n. [NL., from L. rete a net. Cf. Reticule.]
(Anat.)
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.
Note: The fibers of the optic nerve and the retinal blood
vessels spread out upon the front surface of the
retina, while the sensory layer (called Jacob's
membrane), containing the rods and cones, is on the
back side, next the choroid coat.
Based on Webster's Revised Unabridged Dictionary
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Retina : Retina: The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain. There is a small area, called the
macula, in the retina that contains special light-sensitive cells. The macula allows us to see fine details clearly.
The eye has a number of other components. These include the cornea, iris, pupil, lens, optic nerve and vitreous.
The cornea is the clear front window of the eye that transmits and focuses light into the eye.
The iris is the colored part of the eye that helps regulate the amount of light that enters the eye.
The pupil is the dark aperture in the iris that determines how much light is let into the eye.
The lens is the transparent structure inside the eye that focuses light rays onto the retina.
The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain.
The vitreous humor is a clear, jelly-like substance that fills the middle of the eye.
Based on Webster's Revised Unabridged Dictionary (1913)
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Example Usage of Retina |
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Audioworm: @mmmatthijs My left Retina has some sort of fault. Her dad's an eye surgeon. Might be doing my consltation :P |
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LadyRafaela: RT @garciasales: RT: @Alelex88: toda vez que você explica uma piada, um unicórnio sofre descolamento de Retina |
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ajlopez: RT @francismata: Artificial Retina gives woman limited vision after decades of darkness - http://bit.ly/7wbGEZ #cnn |
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