Definition of retina in English:


Line breaks: ret¦ina
Pronunciation: /ˈrɛtɪnə

noun (plural retinas or retinae /-niː/)

  • A layer at the back of the eyeball that contains cells sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
    More example sentences
    • And for vision it is also necessary that there should be visual purple behind the retina and an opaque cornea and iris.
    • As with similar work in the United States, the prosthetic retina works by passing artificially stimulating the optic nerve, in line with signals from a tiny digital camera mounted on a pair of glasses.
    • The chip captures light that enters the eye, and generates an electrical signal that is transmitted to the overlaying neural cells of the retina.



More example sentences
  • Young says the discovery could lead to the improvement of retinal transplants for patients with eye diseases and to brain-cell transplants for the treatment of Parkinson's disease.
  • Richard shows slides to her digital camera, but this will not produce images that are processed in an analogous way to the human brain processing retinal information.
  • Biometric information, whether it be pictures, fingerprints, retinal scans, or something else, does not prevent counterfeiting; it only prevents one person from using another's card.


late Middle English: from medieval Latin, from Latin rete 'net'.

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