A<unk>  is a moon-shaped feature that can develop at the temporal (lateral) border of disc (it rarely occurs at the nasal border) of<unk>  eyes. It is primarily caused by atrophic changes that are genetically determined, with a minor contribution from stretching due to elongation of the eyeball. In<unk>  that is no longer progressing, the<unk>  may be asymptomatic except for its presence on ocular examination. However, in high-degree<unk> , it may extend to the upper and lower borders, or form a complete ring around the optic disc and form a central scotoma. The<unk>  is commonly seen in pathological axial<unk> . The condition sometimes described erroneously as<unk>  choroiditis, but<unk>  is not an inflammatory process and does not run parallel to the degree of<unk> . It usually tends to occur after mid adult life.<unk>  is often associated with some degree of retinal degeneration and occasionally vitreous degeneration.
Myopic crescent
Contour threads
Ossification center
Vitreomacular adhesion
Stenopaeic slit
Foveal avascular zone
Epiretinal membrane
Optic cup 