Where does “erythropsia” come from?

erythropsia (English) comes from English -opsia, from Ancient Greek -οψία, from Ancient Greek ὄψις, from Ancient Greek ὄψ, from Proto-Hellenic wókʷs, from Proto-Indo-European wekʷ- — to speak, to sound out.

erythropsia (English): An abnormality of vision causing objects to...

Definitions

An abnormality of vision causing objects to...

Ancestry of “erythropsia”, step by step

Step	Language	Word	Meaning
1	English	-opsia	Forming compound nouns denoting specific...
2	Ancient Greek	-οψία	sight
3	Ancient Greek	ὄψις	view
4	Ancient Greek	ὄψ	voice; word; eye, face
5	Proto-Hellenic	wókʷs	voice
6	Proto-Indo-European	wekʷ-	to speak, to sound out

Every word from Proto-Indo-European wekʷ- →Every word from Proto-Hellenic wókʷs →Every word from Ancient Greek ὄψ →