Kuebler AG, Halfter K, Reznicek L, et al. - Researchers conducted this observational, retrospective study to examine the sensitivity of the color vision test by Arden in patients with dysthyroid optic neuropathy (DON) to improve diagnosis. They involved the records of 92 eyes (48 patients; 35 female and 13 male) with a diagnosis of DON between 2008 and 2019 in order to assess the full spectrum of findings from the color vision test by Arden and to determine the potential importance of this test. They discovered blue-yellow (tritan) deficiency, to be a sensitive and reliable indicator of dysthyroid optic neuropathy. They conclude that in cases of suspected DON, a color vision test capable of detecting tritan deficiency is an essential tool for proper assessment, diagnosis, and treatment of DON.