An optical instrument used to present different visual images to each eye separately, testing vision and binocular function.
From Greek 'haplous' (single) + 'skopein' (to view). A scientific instrument developed in the 19th century for vision research.
Haploscopes are cool because they let doctors show each of your eyes a completely different picture to test whether they're working together properly—it's like a vision lie detector!
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