What does the abbreviation 'OS' denote?

The abbreviation 'OS' stands for 'oculus sinister,' which is Latin for 'left eye.' In medical terminology, especially in fields like optometry and ophthalmology, such abbreviations are commonly used to specify laterality in eye examinations and prescriptions. Recognizing these abbreviations is crucial for accurately interpreting medical charts and instructions regarding eye treatments or corrections.

To clarify, 'OD' refers to the right eye (oculus dexter), and 'OU' indicates both eyes (oculus uterque). Understanding these terms is essential for ensuring proper patient care and avoiding mistakes in medication administration or treatment plans.