The spherical shape of the eyeball is maintained primarily by the intraocular pressure generated by the fluids inside the eye, mainly the aqueous humor and the vitreous humor. The aqueous humor is a clear fluid that fills the front part of the eye between the cornea and the lens, while the vitreous humor is a gel-like substance that fills the back part of the eye, helping to support its shape.
These fluids provide pressure that helps maintain the eye’s round form. Additionally, the sclera, the white part of the eye, also contributes by providing a tough, protective outer layer that helps preserve the structural integrity of the eyeball. Proper fluid balance within the eye is essential for maintaining its shape.