What is the Choroid?
The choroid is the posterior and most extended portion of the uvea (media vascular layer). This thin membrane is interposed between the deep face of the sclera (external fibrous layer) and the most superficial layer of the retina (internal nervous layer).
The choroid is a pigmented and extraordinarily vascularized tissue; in fact, its main function is to supply nutrients and oxygen to most of the ocular structures.
The choroid membrane can be the site of inflammatory processes (choroiditis), tumors (especially melanomas) and congenital malformative anomalies (absence of the choroid, coloboma, toxoplasma or cytomegalovirus choroiditis acquired in the prenatal period).
