What does O.S. refer to in medical terms?

In medical terminology, "O.S." is an abbreviation for "Oculus Sinister," which translates from Latin to "left eye." This terminology is frequently utilized in the field of optometry and ophthalmology to distinguish between the right and left eye. The corresponding term for the right eye is "O.D." or "Oculus Dexter." Knowing these abbreviations is crucial for healthcare professionals when prescribing medications or treatments that are eye-related, ensuring clear and accurate communication about which eye is being addressed.

The other options do not relate to the correct meaning of "O.S." in a medical context; while they may use similar terms or concepts associated with eye care, they lack the precise definition that "Oculus Sinister" provides. Understanding these distinctions is essential for anyone working in healthcare, particularly in roles involving medication management or eye care.