Tanyatuth PadungkiatsagulLakshmi LeishangthemHeather E. MossFaculty of Medicine Ramathibodi Hospital, Mahidol University2022-08-042022-08-042021-06-01Journal of neuro-ophthalmology : the official journal of the North American Neuro-Ophthalmology Society. Vol.41, No.2 (2021), e230-e231153651662-s2.0-85107082105https://repository.li.mahidol.ac.th/handle/20.500.14594/78160ABSTRACT: Iris heterochromia is typically seen in association with congenital Horner syndrome. A man in his 40s with congenital iris heterochromia, blue in the right and brown in the left, presented with left-sided Horner syndrome. This was associated with recent change in color of his brown left iris to blue similar to the right iris. This case demonstrates a unique case of adult-onset Horner syndrome with reversal of iris heterochromia.Mahidol UniversityMedicineArticleSCOPUS10.1097/WNO.0000000000001089