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Image:Schematic diagram of the human eye with English annotations.svg

The sclera is the opaque (usually white), fibrous, protective layer of the eye containing collagen and elastic fibers.<ref name="Cassin">Cassin, B. and Solomon, S. Dictionary of Eye Terminology. Gainsville, Florida: Triad Publishing Company, 1990.</ref> In children, it is thinner and shows some of the underlying pigment, appearing slightly blue. In the old, however, fatty deposits on the sclera can make it appear slightly yellow.

[edit] Diseases and disorders

Main article: List of eye 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.

[edit] References

Sensory system - Visual system - Eye - edit
Fibrous tunic: Conjunctiva | Sclera | Cornea | Schlemm's canal | Trabecular meshwork  Uvea: Choroid | Iris | Pupil | Ciliary body  Retina : Macula | Fovea | Optic disc  Anterior segment (Anterior chamber, Aqueous humour, Posterior chamber, Lens) | Posterior segment (Vitreous humour)

Sensory system - Visual system - edit
Eye | Optic nerve | Optic chiasm | Optic tract | Lateral geniculate nucleus | Optic radiation | Visual cortex

Muscles of orbit

Levator palpebrae superioris muscle - Superior rectus muscle - Inferior rectus muscle - Lateral rectus muscle - Medial rectus muscle - Superior oblique muscle - Inferior oblique muscle

de:Sclera

es:Esclerótica it:Sclera lt:Odena nl:Sclera pl:Twardówka ru:Склера zh:巩膜