The histopathology of black ball hyphema: a report of two cases

Two black ball clots manually expressed through limbal incisions four and seven days after total traumatic hyphema were examined histologically. The surface of both clots consists of a fibrin "pseudocapsule" with no attachments to intraocular structures. There is a cohesive internal structure formed by concentric fibrin layers. No fibroblastic or neovascular activity was present. Intracameral clots evolve differently than intravascular clots. True organization of the black ball hyphema clot does not appear to take place within the first seven days after black ball hyphema secondary to contusion trauma.