Correction to: Eye (2010) 24, 1044–1050. doi:10.1038/eye.2009.246; published online 16 October 2009

Since the publication of the above article, the authors have noticed that the date and number of the approval by the local ethics committee of Ministry of Health, Ankara Research and Training Hospital, and the patient evaluation period given in the first paragraph of the Materials and methods section are incorrect. The paragraph should read as follows:

The study was approved by the local ethics committee of Ministry of Health, Ankara Research and Training Hospital (14 February 2008, Number 00155) and patient recruitment began. The authors declared that they have no conflict of interest. A total of 90 eyes of 45 patients with TO were prospectively evaluated for this study between 1 April 2008 and 1 December 2008. The diagnosis of TO was made, when two of the following three signs of the disease were present:1 2 (1) Concurrent or recently treated immune-related thyroid dysfunction: Graves hyperthyroidism, Hashimoto's thyroiditis, and the presence of circulating thyroid antibodies without a coexisting dysthyroid state; (2) typical orbital signs (one or more of the following): unilateral or bilateral eyelid retraction with typical temporal flare (with/or without lagophthalmos), bilateral proptosis (as evidenced by comparison with patient's old photos), restrictive strabismus in a typical pattern compressive optic neuropathy, fluctuating eyelid oedema/erythema, chemosis/caruncular oedema; and (3) radiographic evidence of TO including unilateral/bilateral fusiform enlargement of one or more of the following: medial rectus muscle, inferior rectus muscle, superior rectus–levator complex. In all patients, assessment of activity of TO was carried out using Clinical Activity Score (CAS) based on the classification system proposed by Mourits et al.1 3

The authors would like to apologise for this mistake.