What does the abbreviation "OS" represent in medical terms?

In medical terminology, the abbreviation "OS" stands for "oculus sinister," which is Latin for "left eye." This abbreviation is commonly used in prescriptions or medical documentation to specify treatment or measurements pertaining to the left eye. Understanding these abbreviations is crucial for interpreting medical instructions accurately, especially when it comes to administering eye drops or other treatments.

In contrast, "OD" refers to "oculus dexter," meaning "right eye," while "OU" indicates "oculus uterque," representing "both eyes." The abbreviation related to the right ear would be "AD" for "auris dextra," which is unrelated to the question at hand. Recognizing these terms is essential for ensuring proper patient care and medication administration.