focometer
noun
fo·com·e·ter
fō-ˈkäm-ət-ər 
variants
also focimeter
: an instrument for measuring either the visual or the photographic focal length of an objective or of another optical system
Cite this Entry
“Focometer.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/focometer. Accessed 1 Dec. 2025.
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