dioptometer
di·op·tom·e·ter
noun \(ˌ)dī-ˌäp-ˈtäm-ət-ər\Definition of DIOPTOMETER
: an instrument used in measuring the accommodation and refraction of the eye
—di·op·tom·e·try \-ˈtäm-ə-trē\ noun, plural di·op·tom·e·tries
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