A medical condition involving the complete or partial loss of vision, particularly vision in a portion of the visual field.
From Ancient Greek 'an-' (without) + 'opsia' (vision, from 'ops' meaning eye), a clinical term that emerged in 19th-century medicine as understanding of the nervous system improved.
Anopsia is different from blindness—a person with anopsia might see perfectly well on one side but have a complete blind spot on the other, which neurologists can trace to specific damage in the brain or optic nerve.
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