The sclera is the (usually) white outer coating of the eye made of tough fibrin connective tissue which gives the eye its shape and helps to protect the delicate inner parts.

In children, it is thinner and shows some of the inlying blueness.

Diseases and disorders

There are some diseases like scleritis that cause partial blindness. These diseases produce a dark vertical line through the eye sight which cause less than 100% visibility.

eye

Sclera | Esclerótica | Sclera | Odena | Sclera | Twardówka | Склера | 巩膜