A person who has amblyopia, or weak vision in one or both eyes, usually from childhood.
From Greek 'amblys' (blunt, dull) + 'ops' (eye, vision), literally meaning 'dull-eyed.' The term was adopted into medical English in the 19th century to describe patients with this vision condition.
An amblyope's brain literally hasn't learned to see properly with one eye—it's like having visual software that never got installed, which is why early intervention in kids is so critical.
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