Where does “opticus” come from?

opticus (Medieval Latin) comes from Ancient Greek ὀπτικός, from Ancient Greek ὄψις, from Ancient Greek ὄψ, from Proto-Hellenic wókʷs, from Proto-Indo-European wekʷ- — to speak, to sound out.

opticus (Medieval Latin): optic, optical; optic; of or relating to seeing,...