The abbreviations OD and OS that may be included with corrective eyewear prescriptions stand for “oculus dexter” and “oculus sinister.” In other words, this is Latin for “right eye” an ...

A 53-year-old male was referred with a growing pterygium in his right eye (OD). He had previously undergone pterygium surgery in the left eye (OS). He had a right nasal pterygium extending 3 mm ...