What is the white part of the eye called?

The white part of the eyeball is called sclera, tough texture, mainly composed of dense and interlaced collagen fibers, connected to the cornea in front, at the junction of the posterior and optic nerve, sclera is divided into two layers, the outer 2/3 of the transition in the optic nerve sheath, the inner 1/3 was mesh-like, called sclera cribriform, optic nerve fiber bundle from this out of the eyeball. Sclera thickness varies everywhere, the thinnest attachment of the extraocular muscle is about 0.3 mm, the last about 1.0 mm around the optic nerve. Sclera is divided into superficial sclera, scleral parenchyma and brown-black lamella. Sclera has almost no blood vessels, but there are dense vascular connective tissue in superficial sclera. Sclera surface is wrapped by eyeball fascia, and the front is covered by bulbar conjunctiva. It is combined with corneoscleral limbus, cornea, sclera and conjunctiva.