pupillometer
pu·pil·lom·e·ter
noun \ˌpyü-pə-ˈläm-ət-ər\Definition of PUPILLOMETER
: an instrument for measuring the diameter of the pupil of the eye
—pu·pil·lom·e·try \-ə-trē\ noun, plural pu·pil·lom·e·tries
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