Consists of 3 things the Iris, Ciliary body and Choroid
Iris – Anterior part of Uvea, Divided by a collarette into Pupillary and ciliary.
Two muscles Sphincter pupillae (Constricts the pupil) and Dilator Pupillae (Dilates the pupil)
Major arterial circle – Present on the root of the iris (Ciliary Body face) – responsible for Hyphema (D-shaped pupil) formation during blunt trauma.
Minor arterial circle – In the collarette between pupillary and ciliary iris.
Ciliary Body – Anterior part – Pars Plicata and Posterior part – Pars Plana
Function – Aqueous Humor production and Accommodation reflex.
Pars Plana – through which only you can enter into Vitreous Humor (to aspirate fluids or for surgery).
The maximum risk of sympathetic ophthalmitis.
Choroid – The most vascular structure of the eye (85% of ocular blood flow)
Vortex veins of the eye are the veins that drain the blood from the uvea particularly the choroid.
Supplies nutrients to the outer retina and is responsible for thermoregulation.
4 layers – Choriocapillaries layer, Bruch’s membrane, and Haller, Sattler.
Malignant Melanoma of Choroid – m/c ocular tumor in adults.