noun, plural retinas, retinae
[ret-n-ee] /ˈrɛt nˌi/ (Show IPA). Anatomy.
the innermost coat of the posterior part of the eyeball that receives the image produced by the lens, is continuous with the optic nerve, and consists of several layers, one of which contains the rods and cones that are sensitive to light.
Retina, a brand name used by Apple, Inc., to describe display screens having a resolution so high that it is difficult to see individual pixels with the human eye:
a Retina display; Retina technology; Retina quality.
noun (pl) -nas, -nae (-ˌniː)
the light-sensitive membrane forming the inner lining of the posterior wall of the eyeball, composed largely of a specialized terminal expansion of the optic nerve. Images focused here by the lens of the eye are transmitted to the brain as nerve impulses
retina ret·i·na (rět’n-ə)
n. pl. ret·i·nas or ret·i·nae (rět’n-ē’)
The delicate multilayered light-sensitive membrane lining the inner posterior chamber of the eyeball containing the rods and cones and connected by the optic nerve to the brain.
Plural retinas or retinae (rět’n-ē’)
The light-sensitive membrane that lines the inside of the back of the eyeball and connects to the brain by the optic nerve. The retina of vertebrate animals contains rods and cones, specialized cells that absorb light.
The inner layer of the eye, sensitive to light, that is connected to the brain by the optic nerve. The retina lines the rear of the eye-ball. The lens of the eye focuses waves of light on the retina.
adjective 1. of or relating to the retina of the eye. noun, Biochemistry. 1. an orange pigment, C 2 0 H 2 8 O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde. retinal ret·i·nal (rět’n-āl’, -ôl’) n. See retinaldehyde.
- Retinal adaptation
retinal adaptation n. Adjustment of the eye to the degree of illumination.
- Retinal cone
retinal cone n. See cone cell.
retinaldehyde ret·i·nal·de·hyde (rět’n-āl’də-hīd’) n. A yellow to orange aldehyde that is a derivative of vitamin A and acts in the retina to form the visual pigments of the rods and cones. Also called retinal, retinene1.