The practice or science of measuring refractive errors of the eye and determining the correct lens prescription for vision correction.
From Greek 'diopter' (optical power) + '-metry' (the process of measuring), following the standard formation of scientific measurement fields like geometry or spectroscopy.
Dioptometry is the specific science behind reading your eye prescription—it's distinguished from optometry because it focuses purely on the mathematical measurement of light refraction rather than the broader practice of eye care.
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