Final answer:
The suspensory ligaments, aqueous humor, vitreous humor, and choroid all play important roles in maintaining the eyeball's shape and function.
Explanation:
Suspensory ligaments help maintain the eyeball's spherical shape by holding the lens in place and exerting tension on the lens through the membranous capsule.
Aqueous humor and vitreous humor aid in keeping the eye in shape and focusing. The aqueous humor maintains the convex shape of the cornea, while the vitreous humor supports the lens and maintains the shape of the eye.
Choroid is part of the vascular tunic of the eye, providing a blood supply and absorbing excess light.
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