What does retina mean?

Definitions for retina
ˈrɛt n ə, ˈrɛt nə; ˈrɛt nˌireti·na

Here are all the possible meanings and translations of the word retina.

Princeton's WordNet

  1. retina(noun)

    the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve

Wiktionary

  1. retina(Noun)

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

    Etymology: From retina, the diminutive form of rete, probably from the phrase (tunica) , literally "net-like tunic", used to describe the blood vessel system at the back of the eye.

Webster Dictionary

  1. Retina(noun)

    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

    Etymology: [NL., from L. rete a net. Cf. Reticule.]

Freebase

  1. Retina

    The vertebrate retina is a light-sensitive layer of tissue, lining the inner surface of the eye. The optics of the eye create an image of the visual world on the retina, which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centres of the brain through the fibres of the optic nerve. In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, so the retina is considered part of the central nervous system and is actually brain tissue. It is the only part of the CNS that can be visualized non-invasively. The retina is a layered structure with several layers of neurons interconnected by synapses. The only neurons that are directly sensitive to light are the photoreceptor cells. These are mainly of two types: the rods and cones. Rods function mainly in dim light and provide black-and-white vision, while cones support daytime vision and the perception of colour. A third, much rarer type of photoreceptor, the photosensitive ganglion cell, is important for reflexive responses to bright daylight.

Chambers 20th Century Dictionary

  1. Retina

    ret′i-na, n. the innermost coating of the eye, consisting of a fine network of optic nerves.—adj. Ret′inal, pertaining to the retina of the eye.—n. Retinī′tis, inflammation of the retina. [Fr.,—L. rete, a net.]

The Nuttall Encyclopedia

  1. Retina

    a retiform expansion of the sensatory nerves, which receives the impression that gives rise to vision, or visual perception.

U.S. National Library of Medicine

  1. Retina

    The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.

Editors Contribution

  1. retina

    A facet of the mechanism of an eye.

    Any animal, insect or human that has an eye has a retina that is part of the mechanism that enables them to see.

    Submitted by MaryC on February 2, 2020  

Anagrams for retina »

  1. retain

  2. tin ear

How to pronounce retina?

  1. Alex
    Alex
    US English
    Daniel
    Daniel
    British
    Karen
    Karen
    Australian
    Veena
    Veena
    Indian

How to say retina in sign language?

  1. retina

Numerology

  1. Chaldean Numerology

    The numerical value of retina in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of retina in Pythagorean Numerology is: 4

Examples of retina in a Sentence

  1. Christopher Quinn:

    When you look directly at the sun, the intensity of the light and the focus of the light is so great on the retina that it can cook it, if the exposure is great enough, that can and will lead to permanent reduction in vision and even blindness.

  2. Emily Chew:

    The retina is an extension of the brain, a third of your brain functions for vision and the retina lines the eyeball and travels back via an optic nerve all the way to the brain.

  3. James Wolffsohn:

    The lens seems an interesting concept to provide optical magnification to the retina when required.

  4. Tom Spetalnick:

    There is a standard of care when an eye doctor is expected to perform an eye exam and the eye exam is expected to determine if the patient does or doesn't have things like glaucoma, retina problems, even diabetes can be detected.

  5. Mary Jo Rapini:

    Bright light works by stimulating cells in the retina that connect to the hypothalamus, a part of the brain that helps control circadian rhythms.

Images & Illustrations of retina

  1. retinaretinaretinaretinaretina

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Translations for retina

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"retina." Definitions.net. STANDS4 LLC, 2020. Web. 1 Jun 2020. <https://www.definitions.net/definition/retina>.

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