Fig. 2

Representative swept-source optical coherence tomography images taken according to the stage system. A: Stage 1—negligible morphological or anatomical disruption, retinal layers, and foveal pit are identified. B: Stage 2—characteristic stretching of the outer nuclear layer, absence of foveal depression, retinal layers are identified. C: Stage 3—continuous ectopic inner foveal layers (white triangles) crossing the central foveal area, absence of foveal depression, retinal layers are identified. D: Stage 4—significant retinal thickening, remarkable anatomical disruption of the macula, continuous ectopic inner foveal layers crossing the entire foveal area, retinal layers are significantly distorted (DRIL, red arrows), and the foveal pit is absent