Retina
/rˈɛtənə/
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Definition
(noun) The thin layer of cells at the back of the eyeball that contains rods and cones sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
Sentence Examples
The image projected onto the retina is inverted.
The security system scanned Tom's retina.
CEFR Practice Quiz
The doctor used a special instrument to examine the ____ at the back of the patient's eye.