dioptriciann.

/dʌɪɒpˈtrɪʃən/Etymology: < dioptric adj. and n.; compare optician.
rare.
the world > physical sensation > sight and vision > one skilled in optics > [noun] > in the refraction of light
1671 (Royal Soc.) 5 2045 An Un-usual kind of Refraction, hitherto un-observed by Dioptricians.
This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2021).