Diagnostic Ability of Barrett's Index and Presence of Intracranial Fat Prolapse in Dysthyroid Optic Neuropathy.

Background: Dysthyroid optic neuropathy (DON) is one of the most serious visual loss threats for patients with Graves' ophthalmopathy (GO). Barrett's index (BI) and intracranial-fat prolapse have been used in diagnosing DON. However, these parameters are rarely used in Southeast Asian populations with a variety of cut-off values.