retina
noun
ret·i·na
| \ ˈre-tə-nə
, ˈret-nə\
, ˈret-nə\
plural retinas
also retinae\ ˈre-tə-ˌnē
, -ˌnī \
, -ˌnī \
Definition of retina
: the sensory membrane that lines the eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve — see eye illustration
Examples of retina in a Sentence
Recent Examples on the Web
Anderson, a nurse living in Watertown, South Dakota, told TODAY she was diagnosed with a hemangioblastoma, a rare, benign tumor typically found in the brain, spinal cord or retina. — Fox News, "Bride with golf ball-sized brain tumor swore she would 'crawl down aisle' on wedding day if she couldn't walk," 26 Aug. 2019 Albright says the treatment will be provided during outpatient surgery, in which the surgeon will inject the molecular gene editing machinery under the retina. — Time, "CRISPR Gene Editing Is Being Tested in Human Patients, and the Results Could Revolutionize Health Care," 6 Aug. 2019 Another trial is recruiting patients who have a genetic eye disorder, injecting a CRISPR treatment just beneath the retina in an effort to prevent vision loss. — Michael Nedelman And Minali Nigam, CNN, "Trial underway in US uses CRISPR gene-editing in people with severe sickle cell disease," 30 July 2019 In April, the institute began testing one that involves transplanting retinal cells made from stem cells below the retina in the hopes of replacing dysfunctional cells and tissues. — Jonathan Saltzman, BostonGlobe.com, "Stem-cell biotech seeing strong growth," 2 July 2019 Neuralink also intends to have the electrodes write signals back into the brain to provide sensory feedback in the form of touch or visual stimulation of the retina in a blind person. — Tanya Lewis, Scientific American, "Elon Musk’s Secretive Brain Tech Company Debuts a Sophisticated Neural Implant," 17 July 2019 Since that would be rather unwieldy, only one tiny area of the retina—called the fovea—provides this kind of resolution. — Tim Vernimmen, Smithsonian, "Our Eyes Are Always Darting Around, So How Come Our Vision Isn’t Blurry?," 14 June 2019 The implant provides electrical stimulation of the retina to induce visual perception. — Caren Chesler, Popular Mechanics, "A Vision Quest," 6 Mar. 2019 People with cognitive impairment had fewer capillaries in their retina than those who did not. — Katherine Ellen Foley, Quartz, "Scientists may have found a better way to spot early signs of dementia: our eyes," 11 July 2019These example sentences are selected automatically from various online news sources to reflect current usage of the word 'retina.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Keep scrolling for more
Keep scrolling for more
More Definitions for retina
retina
noun
English Language Learners Definition of retina
: the sensitive tissue at the back of the eye that receives images and sends signals to the brain about what is seen
See the full definition for retina in the English Language Learners Dictionary
retina
noun
ret·i·na
| \ ˈre-tə-nə
\
\
plural retinas
also retinae\ -ˌnē \
Kids Definition of retina
: the membrane that lines the back part of the eyeball, contains the rods and cones, and converts the images received by the lens into signals that are transmitted to the brain
retina
noun
ret·i·na
| \ ˈret-ᵊn-ə, ˈret-nə
\
\
plural retinas
also retinae\ -ᵊn-ˌē
\
\
Medical Definition of retina
(Entry 1 of 2)
: the sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of several layers including one containing the rods and cones, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve
Retin-A
trademark
Ret·in-A
| \ ˌret-ᵊn-ˈā
\
\
Medical Definition of Retin-A (Entry 2 of 2)
—used for a preparation of tretinoin
Keep scrolling for more