Eye cup and Optic cup

Eye cup noun - A small vessel with a rim curved to fit the orbit of the eye; use to apply medicated or cleansing solution to the eyeball.

Optic cup and eye cup are semantically related. In some cases you can use "Optic cup" instead a noun phrase "Eye cup".

Optic cup noun - (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina.

Eye cup and optic cup are semantically related. Sometimes you can replace phrase "Eye cup" with "Optic cup", this phrases are similar.