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vision
Introduction References & Edit History
Images & Videos
Diagram of a human head in profile with labeled regions highlighting the five senses: touch on the forehead, sight at the eye, smell in the nose, taste in the mouth, and hearing at the ear. optical arrangements of eyes among nocturnal, arhythmic, and diurnal animals Diagram showing how visual information from an object enters the left and right eyes, travels along the optic nerves, crosses at the optic chiasma, and reaches the occipital lobes in the brain for image processing. A labeled flowchart shows how eye movement is controlled: signals move from retina feedback and error evaluation, to a brain control center, to eye movement muscles, resulting in eye movements. Feedback loops monitor actual eye position to keep vision stable.
Are carrots actually good for eyesight?
Understand how diffraction of light affects stellar images
A close up image of a colorful bug with large eyes.
Uncover the science behind myopia and its underlying causes
Hear about experimental personalized 3-D screens that can correct refractive errors in a user's vision
The difference between nearsightedness and farsightedness
Quizzes
Male muscle, man flexing arm, bicep curl.
Facts You Should Know: The Human Body Quiz
Muscles of facial expression, human anatomy, (Netter replacement project - SSC). Human face, human head.
Characteristics of the Human Body
Quick Facts
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vision

physiology
Also known as: eyesight, sight
Written and fact-checked by
Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

vision, physiological process of distinguishing, usually by means of an organ such as the eye, the shapes and colours of objects. See eye; photoreception.