The {{c1::vitreous cavity}} is the largest cavity of the eye, containing 2/3rds of the eye volume, around {{c2::4 mL}}.It is fill with {{c1::vitreous humor}}, a gel composed of 98% water as well as hyaluronic acid and collagen fibers.
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The middle tunic is the {{c1::uveal tract}} which consists of the {{c2::iris}}, {{c2::ciliary body}}, and {{c2::choroid}}. The {{c1::uveal tract}} is highly vascular.{{c1::Uveitis}}: inflammation in this area.