(a)
(b)
(c)
(d)
Figure 1: (a) Stage 1: (a) presence of the foveal pit with minimal epiretinal membrane; (b) distinguishable retinal layers. (b) STAGE 2: (a) absence of foveal pit; (b) distinguishable retinal layers. (c) STAGE 3: (a) presence of ectopic inner foveal layer; (b) distinguishable retinal layers despite some distortion. (d) STAGE 4: (a) presence of ectopic inner foveal layer; (b) undistinguishable retinal layers due to severe distortion.