Secondary functions are to assist in refraction through accommodation and pupillary constriction. The uveal tract mirrors all systemic vascular diseases due to its dense vascular makeup. Provides nutrition of anterior segment by diffusion through the aqueous humor. Also has sphincter and dilator muscle to control amount of light entering eye. The inner layer of the uveal tract which secretes aqueous and contracts producing variable tensions on the lens zonules, thereby changing refraction.
Many causes are possible for anterior uveitis.
Rhegmatogenous retinal detachment 2. Posterior segment tumor 3. Juvenile xanthogranuloma 4. Intraocular foreign body 5. Complete history, with systemic health history directed at most likely etiology 2.