Fig. 4

Foveal attachment status in primary RRD of different extent secondary to a 12 o’clock break. Clinically, the fovea is likely to be detached if the trough of the RRD makes a tangent to the visual axis as the RRD meets the RPE in an acute angle (a). Clinically, the corrugation of the retina can shorten the retina sufficiently to reveal the detached fovea, even if the posterior extend of the RRD is at the fovea (b). If the first order supero-temporal arcade vessel is visible on the RRD (c), the fovea is detached even in the mathematical model (d)