“…Anatomic changes associated with periocular and orbital diseases such as blepharoptosis, eyelid lesions, and even thyroid-associated orbitopathy have also been successfully characterized with ultrasonography (Hosal et al, 2004;Lee et al, 2006;Kikkawa et al, 2003;Furuta et al, 2007;Bajaj et al, 2007;Given-Wilson et al, 1989). Also, it can be used as an aid to set up a assessment score for better classification of DEC (Huang et al, 2014). However, no studies establishing a baseline normal value of preseptal thickness evaluated by ultrasound has been found.…”