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.
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.
The major internal reinforcement of the posterior part of the eyeball is provided by the vitreous humor. Here is the step-by-step explanation:
1. The vitreous humor is a clear, gel-like substance that fills the space between the lens and the retina, occupying about two-thirds of the volume of the eyeball.
2. It is composed mainly of water, along with collagen fibers and other proteins.
3. The vitreous humor helps to maintain the shape of the eyeball and provide internal support. It keeps the retina pressed firmly against the back wall of the eyeball, ensuring proper function and visual clarity.
4. By exerting a gentle pressure on the retina, the vitreous humor helps to maintain the delicate structure of the retina and optimize the transmission of light to the photoreceptor cells.
5. Additionally, the vitreous humor also acts as a shock absorber, protecting the delicate structures of the eye from impact or trauma.
Overall, the vitreous humor plays a crucial role in maintaining the structural integrity and function of the posterior part of the eyeball.