Angioid streaks are also known as Knaps streak. They are breaks or cracks in a Bruch's membrane involve choroid and can cause choroidal neovascularization.

The causes are as follows: Pseudo xanthoma elasticum Paget disease Ehlers-Danlos syndrome Acromegaly Lead poisoning Old age Sickle cell anemia Myopia Hereditary spherocytosis Hemochromatosis Myopia  Diabetes mellitus Sturge-Weber syndrome Neurofibromatosis 50% of them have no systemic cause Share your opinions.