Figure 16-19 Optic nerve pit with macular detachment, retinal thinning, and retinal pigment epithelial atrophy. A, Fundus photograph shows an abnormal temporal optic nerve head appearance with an excavation, or pit (arrow). The adjacent retina is thickened and elevated, extending into the macula (outlined by arrowheads).B, Optical coherence tomography scan illustrates subretinal fluid (pound sign) associated with the optic pit. Note the degenerated outer segments (arrow) of the photoreceptors.