What does the abbreviation "OS" refer to in a medical context?

In a medical context, the abbreviation "OS" stands for "sinister oculus," which is Latin for "left eye." This term is commonly used in ophthalmology and other healthcare settings to denote the left eye when charting or prescribing medications for visual-related issues.

The other terms in the context of eye care have their own abbreviations: "OD" refers to the right eye, "OU" stands for both eyes, and there isn't a standard abbreviation for "neither eye." Understanding these abbreviations is crucial for ensuring accurate communication regarding a patient's ocular health and treatment.