What does the abbreviation "OS" refer to in medical terms?

In medical terminology, the abbreviation "OS" stands for "oculus sinister," which is Latin for "left eye." This term is commonly used in healthcare settings, especially in prescriptions and ophthalmological assessments, to specify that the left eye is being referenced. Distinguishing between the left and right eyes is crucial in various medical contexts, particularly when addressing vision issues or administering eye-related treatments.

Understanding this terminology is important for healthcare professionals, as miscommunication can lead to significant errors in treatment. In this context, "OS" specifically serves to denote the left eye, making it clear to professionals which eye they are discussing or treating.