optice
Could not find opticen in Logeion dictionaries.
opticen Noun: feminine accusative singular of optice
optĭcē, ēs, f., = ὀπτική,
- optics: optices non ignarus, Vitr. 1, 1, 4.
opticē, ēs, f. (ὀπτική), die Optik, Vitr. 1, 1, 4.
optĭcē, ēs, f. (ὀπτική), lʼoptique : Vitr. Arch. 1, 1, 4.