It is the thin vascular layer that separates the sclera , from retina, thicker in the posterior pole (the posterior portion of the eyeball) and less on the outskirts (the front portion of the eyeball). E 'anatomically divided into 2 party: theuvea which constitutes the rear, while the front part of this is represented by the ciliary body and by ' iris) . The choroid allows spraying of the outer retina including the photoreceptors and the retinal pigment epithelium, as well as the temperature adjustment the eye. E 'equipped with pigmented cells (which can cause melanoma of the choroid) retinal pigment epithelium, which together, absorb light and reduce reflections of this. And 'responsible for the phenomenon of Red Eye when the eye is hit by the flash in the photographs. Inflammations of the choroid are known these choroiditis