A condition of the eye or vision where diplopia (double vision) is corrected so that only one image is seen, or relating to single vision.
From Greek 'haplous' (single) + 'opia' (vision condition). A medical term for vision states, likely developed in 19th-century ophthalmology.
While diplopia means seeing double, haplopia means seeing single—it's the normal, happy state where your two eyes work together to create one clear picture of the world.
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