Chorioretinal Folds

• Undulations of the choroid and the overlying structures.

Causes

• Most commonly idiopathic.
• Others include hyperopia, choroidal tumor or detachment, choroidal neovascular membrane, optic disk swelling, orbital tumors, scleral buckle, hypotony, orbital and scleral inflammation.

Clinical Features

• Symptoms:
  • Maybe asymptomatic
  • Blurry vision
  • Metamorphopsia if the folds run through the fovea
• Signs:
  • Unilateral or bilateral folds that produce alternating dark and light yellowish streaks on the posterior pole are observed using ophthalmoscopy
  • May have horizontal, oblique or vertical orientation that are parallel to each other or may have an irregular or radiating pattern

Fluorescein Angiography

• Alternating hypo- and hyperfluorescent lines correseponding to the folds orientation that persist throughout all phases of the study
• The hypofluorescent lines correspond to the dark bands where the RPE cells are compressed in the valleys or troughs of the folds
• The hyperfluorescein lines correspond to the light bands where the Bruch's membrane and RPE cells are stretched on the peak of the folds