Chorioretinal Folds

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