A haircut popularized by teen idols such as Justin Bieber can cause children to develop lazy eye, said a leading Australian optometrist. Optometrists Association national executive member Andrew Hogan said emo-style haircuts with fringes that dangle over one eye can amblyopia, or lazy eye, by preventing the nerve pathway from the amblyopic eye to the brain from developing properly. Hair over the eye acts like an eyepatch, reducing sensory input from the covered eye, weakening it and straining the dominant eye.

Source: News.com.au