The posterior chamber of the eyeball is behind the lens and is filled with a very thick, jelly-like fluid called ________ that keeps the retina flat and helps to maintain the shape of the eye.

Posterior Chamber

A fluid-filled space behind the iris but in front of the lens in the eye, playing a role in the eye's focusing mechanism.

Lens

A piece of transparent material, typically glass or plastic, shaped to focus or redirect light rays, used in glasses, cameras, and other optical devices.

Retina

The light-sensitive layer of tissue at the back of the eye that converts light images into electrical signals sent to the brain.