Definition of retina
retinaeplay \-ˌnē, -ˌnī\
: 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
Recent Examples of retina from the Web
Along with the fireworks there were actual fires, blasts of smoke, streams of confetti, retina-blurring lighting, spastic animations, brain-numbing predictability and very bad singing.
His work ranged from eye-tingling abstractions that emphasized color and pattern to create illusions of radiant light that buzzed on the retina.
The great Italian scientist Galileo burned the retina of his eye watching an eclipse through a telescope.
Normally, there’s a barrier that keeps such cells away from the retina.
He was born with retinopathy of prematurity, a disorder where abnormal blood vessels grow throughout the retina.
This is especially true for incurable conditions that damage the retina, the layer of light-sensitive cells at the back of the eye.
Researchers think that increasing these carotenoids is sort of like adding sunglasses for the retina.
During a two-week leave ordered by the team to help his eye recover from an eighth surgery on a detached retina, Zimmer, a Lockport native, appears to have found some clarity for his plight.
These 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.
Origin and Etymology of retina
Middle English rethina, from Medieval Latin retina, probably from Latin rete net
First Known Use: 14th centurySee Words from the same year
RETINA Defined for English Language Learners
Definition of retina for English Language Learners
: the sensitive tissue at the back of the eye that receives images and sends signals to the brain about what is seen
RETINA Defined for Kids
Definition of retina for Students
: 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
Medical Definition of retina
: 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
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