Posterior Staphyloma —a localized bulging of the back of the eye wall—is considered a definitive sign of PM. Common Complications

Defined by the International Myopia Institute (IMI) as high myopia accompanied by structural changes such as posterior staphyloma, myopic maculopathy, or optic neuropathy.

The mechanical stretching of the eye leads to several vision-threatening conditions: A Review of Pathologic Myopia - PubMed