Choriodal folds and retinal folds

Chorioretinal folds

Chorioretinal folds are wrinkles or undulations in the choroid, Bruch's membrane and retinal pigment epithelium (RPE). Distortion of the choroid (as a result of mechanical force and/or vascular occlusion) is thought to exert pressure on the relatively inflexible Bruch's membrane, which is thrown into folds. Some possible causes are listed in the table below.

Retinal folds

Retinal folds involve only the sensory retina, and are generally narrower than choroidal folds. They most commonly develop when a tractional force is exerted upon a focal area of the retina. Causes include idiopathic epiretinal membranes, chorioretinal scars and fibrovascular proliferation associated with retinal detachment or diabetic retinopathy. In addition, any of the above-listed causes of chorioretinal folds may occasionally produce folds limited to the sensory retina.