The eyeball has three cavities filled with fluid.
(i) Aqueous humor chamber: The cavity between the cornea and the lens is called the aqueous humor chamber. It is filled with a fluid called aqueous humor.
(ii) Posterior chamber: The cavity between iris and lens is called posterior chamber. It is also filled with aqueous humor.
(iii) Vitreous humor chamber: The large chamber between the lens and the retina is called the vitreous chamber. It is 80% of the eyeball. It is filled with a jelly-like fluid called vitreous humor. Vitreous humor is like egg white. Vitreous humor consists of 99% water, 1% collagen and hyaluronic acid. Vitreous humor helps in refraction of light.