eyecup vs optic cup

eyecup and optic cup both are nouns.

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

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

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

eyecup (noun)	optic cup (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