Thyroid eye disease in Eastern Province of Saudi Arabia: clinical profile and correlation with vitamin D deficiency.

Purpose: To obtain clinical data about disease activity and severity of thyroid eye disease (TED) in a tertiary eye hospital in the Eastern Province of Saudi Arabia and to correlate this data with vitamin D levels.

Methods: A clinical observational study was conducted in a specialized eye hospital in Saudi Arabia. It included prospective enrollment of Saudi patients with confirmed TED to evaluate activity and severity according to Clinical Activity Score (CAS) and European Group on Graves' Orbitopathy (EUGOGO), respectively, and also for blood investigation, including thyroid profile and vitamin D levels.