Question

provides major internal reinforcement of the posterior part of the eyeball and helps to keep the retina pressed firmly against the wall of the eyeball.

Answer 1

The answer is the sclera. The sclera is a tough, fibrous layer that forms the outermost layer of the eyeball. It provides the main structural support for the eye and helps to protect the delicate inner structures. In particular, the sclera provides reinforcement to the posterior part of the eyeball, which includes the retina. This helps to keep the retina firmly in place and prevents it from detaching or becoming damaged. The sclera is also responsible for maintaining the shape of the eyeball, which is important for proper focusing of light onto the retina.