Stevan described it first. Study of eye is ophthalmology. Instrument used to examine interior of eye is ophthalmoscope.
More or less spherical so termed as eye ball.
Situated in the eye orbit 1/5 part is out of eye orbit. Between eye ball and orbit are connective tissue, adipose tissue, ligaments, muscles and glandular tissues are present.
2.5 cm in diameter. Largest eye in mammal present in horse (In ratio of body in deer). Largest eye in animals present in giant squid (Archeuthis ) 15" in diameter.