The examination or visual inspection of the eye's optical properties, particularly the study of refraction and light transmission through ocular structures.
From Greek 'diopter' (optical power) + '-scopy' (examination or viewing), literally meaning 'the examination of optical properties.'
While we throw around terms like 'endoscopy' and 'colonoscopy,' dioptoscopy is an older term that specifically means examining how light behaves as it passes through your eye—it's how your eye doctor figures out what's wrong with your vision.
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