The incidence and prevalence of<unk>  are unknown, and no studies have yet investigated its prevalence or incidence. However, it is generally agreed that<unk>  is a very rare condition. Some uncertainty regarding the incidence of<unk>  may be attributed to its confusion with keratoconus.<unk>  is not linked to race or age, although most cases present early in life, between 20 and 40 years of age. While<unk>  is usually considered to affect men and women equally, some studies suggest that it may affect men more frequently. Several diseases have been observed in people with<unk> . However, no causal relationships have been established between any of the associated diseases and the pathogenesis of<unk> . Such diseases include: chronic open angle glaucoma, retinitis pigmentosa, retinal lattice<unk> , scleroderma, kerato-conjunctivitis, eczema, and hyperthyroidism.
Pellucid marginal degeneration
Keratoconus
Optic disc drusen
Posterior cortical atrophy
Vitreomacular adhesion
Geographic atrophy
Enlarged vestibular aqueduct
Choroidal neovascularization