Sclera

[Julian]

[sclera] Is known by most people as the white of the eye. In some animals the sclera is black, but in humans its white. It contains [collagen] and other elastic fibers which serve as a layer to protect the more delicate structures within the eye and maintains the round shape of the eye (helps resist against external forces applied to the eye). The sclera also provides a base on which the [orbital] muscles muscles are attached.

[Becky]

The white outer layer of the eyeball. At the front of the eye it is continuous with the cornea.

[Sonia]

the white layer that covers the outside of the eye

[Donald Trump]

: the dense fibrous opaque white outer coat enclosing the eyeball except the part covered by the cornea — see eye illustration.