What does OS stand for in the context of eye examination?

In the context of eye examinations, OS stands for "Oculus Sinister," which is Latin for "left eye." This terminology is part of a standardized system used by healthcare professionals to describe the eyes. In ophthalmology, abbreviations like OS and OD (Oculus Dexter, meaning right eye) are employed to avoid confusion and ensure clear communication about which eye is being referred to. Understanding these abbreviations is essential for accurately interpreting ophthalmological evaluations and treatment plans.