borrowed from Greek, combining form from ophthalmós "eye," of uncertain origin
Note: The word ophthalmós (in dialects also óktallos, óptil(l)os) has traditionally been placed with other progeny of Indo-European *h3ekw- in Greek, as ópōpa "(I) saw," ópsomai "(I) will see," ómma "eye," etc. (see eye entry 1), though both the phonetic shape and derivational structure are problematic; appeals have thus been made to "une aspiration expressive" to account for -phth-, or to taboo deformation (presumably as a means of averting the evil eye). R. Beekes (Etymological Dictionary of Greek) derives the range of forms from a pre-Greek *okw-taly-(m)-, and regards the similarity of *okw- and outcomes of Indo-European *h3ekw- as coincidental.