What is the name of the jelly-like substance inside the eyeball?

The jelly-like substance inside the eyeball is known as the vitreous. This clear, gel-like material fills the space between the lens and the retina in the eye. It plays an essential role in maintaining the shape of the eyeball and allows light to pass through to the retina, where images are focused. The vitreous also helps support the retina, ensuring that it remains attached to the back of the eye, which is critical for proper vision.

In contrast, aqueous humor is a different fluid that is found in the anterior chamber of the eye, between the lens and the cornea. It is responsible for maintaining intraocular pressure and providing nutrients to the avascular structures of the eye. Corneal fluid is not a recognized term in ophthalmology, and while palpebral fluid might refer to the tears produced by glands, it does not describe the jelly-like substance within the eyeball. Thus, the vitreous is the accurate term for the substance in question.