Vitreous humour is the clear gel that fills the eyeball, lying between the lens and the retina in the eye.

Floaters are small, generally harmless, defects in the vitreous humour.

Where the vitreous humour has become cloudy, vitrectomy is surgery to restore sight in which the surgeon removes cloudy vitreous humor in the eye and replaces it with a salt solution. Vitrectomy is generally not indicated unless sight has already been severely affected, as the operation itself can cause blindness.

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Sensory system - Visual system - Eye	Edit (http://en.wikipedia.org/w/wiki.phtml?title=MediaWiki:Eye)
Retina - Cornea - Iris - Pupil - Lens - Macula - Sclera - Optic fovea - Blind spot - Vitreous humour - Aqueous humour - Choroid - Ciliary body - Conjunctiva - Angle structure - Tapetum lucidum

Sensory system - Visual system

Eye - Optic nerve - Optic chiasm - Optic tract - Lateral geniculate nucleus - Optic radiations - Visual cortex