biophotometer
noun
bio·pho·tom·e·ter
ˌbī-ō-fō-ˈtäm-ət-ər 
: an instrument for measuring the rate and efficiency of dark adaptation of the eye used especially in detecting vitamin A deficiency
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“Biophotometer.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/biophotometer. Accessed 18 Apr. 2024.
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