optic cup vs eyecup

optic cup and eyecup both are nouns.

Word	Noun	Adjective	Verb	Adverb
optic cup	Yes	No	No	No
eyecup	Yes	No	No	No

As nouns, optic cup and eyecup are synonyms defined as:

optic cup and eyecup: (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina

optic cup (noun)	eyecup (noun)
(embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina	(embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina
	a small vessel with a rim curved to fit the orbit of the eye; use to apply medicated or cleansing solution to the eyeball