Final answer:
The jelly-like substance between the lens and retina of the eyeball is called the vitreous humor; it is distinct from the aqueous humor, which fills the anterior chamber of the eye.
Step-by-step explanation:
The vitreous humor is a jelly-like substance located between the lens and the retina of the eyeball. Aqueous humor is a watery fluid that fills the anterior chamber, but it should not be confused with the vitreous humor, which fills the posterior chamber of the eye.
The human eye can be divided into two main cavities: the anterior cavity and the posterior cavity. The anterior cavity includes spaces such as between the cornea and the lens and is filled with the aqueous humor. Contrastingly, the posterior cavity is the area behind the lens extending up to the retina.
It is filled with a clear gel called the vitreous humor, which is almost always sterile and does not have normal microbiota. The vitreous humor, being more viscous, helps to maintain the eye's spherical shape and provides a clear path for light to reach the retina.