Noun
the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball
Source: WordNetA ciliary body was then discovered and the sclera, retina, choroid, and cornea were seen to meet at the same point. Source: Internet
It is helps in conversion of carotene into vitamin A in hepatic cells, therefore, hypothyroidism may lead to high levels of carotene in the blood, resulting in yellowish tint of only skin (and not the mucous membrane, like sclera) called as cartonemia. Source: Internet
Nonetheless, this would be insufficient, since the retina would be flooded with light (from all directions) that ordinarily is blocked by the opaque sclera of the eyeball. Source: Internet
The corneal epithelium is keratinized and the sclera is thick enough to withstand the pressures of diving. Source: Internet