P3H2 and Familial exudative vitreoretinopathy: These ocular and systemic features may overlap and result in variable clinical phenotypes of SS subtypes or sometimes share the phenotypes of other ocular conditions, such as familial exudative vitreoretinopathy (FEVR) [22] or mimic other myopia-related syndromes, such as those caused by recessive mutations in LEPREL1 [23].