Vitreous & Retina

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Retina / Choroid Disorders
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

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