op ‧ tom ‧ e ‧ trist /ɒpˈtɒmətrəst, ɒpˈtɒmɪtrəst $ ɑːpˈtɑː-/ BrE AmE noun [countable] American English
[ Date: 1800-1900 ; Origin: optometer 'eye-testing instrument' (18-21 centuries) , from Greek optos ( ⇨ ↑ optic ) + English -meter ]
someone who tests people’s eyes and orders ↑ glass es for them SYN optician British English