- Undulations of the choroid and the overlying structures.
- 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.
- Maybe asymptomatic
- Blurry vision
- Metamorphopsia if the folds run through the fovea
- 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
- 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