retina

[ret-n-uh, ret-nuh]

noun

Anatomy.

plural

retinas, retinae 

1. 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.

Trademark, Computers.

1. 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.

retina

/ ˈrɛtɪnə /

noun

1. 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

plural

retinas 

1. 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.

retina

1. 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.

Other Word Forms

• retinal adjective

Word History and Origins

Origin of retina¹

1350–1400; Middle English ret ( h ) ina < Medieval Latin rētina, perhaps equivalent to Latin rēt- (stem of rēte ) net + -ina -ine ¹

Word History and Origins

Origin of retina¹

C14: from Medieval Latin, perhaps from Latin rēte net

Example Sentences

It affects the macula, the central region of the retina that contains tightly packed cells used for sharp, detailed color vision.

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The superior colliculus works like a built-in radar, taking direct signals from the retina before the cortex receives them.

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The treatment involves carefully warming the affected tissue by several degrees, a challenging task because it is difficult to measure temperature behind the retina.

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The system includes two main parts: a small camera attached to a pair of glasses and a wireless chip implanted in the retina.

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The procedure begins with a vitrectomy, where the eye's vitreous gel is removed from between the lens and the retina.

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