Patient Care Technician (PCT) AAH Practice Exam

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What does the abbreviation OS stand for?

Right eye
Left eye
Both eyes
Left ear

The correct answer is: Left eye

The abbreviation "OS" stands for "Left Eye" in medical terminology. It is derived from the Latin term "oculus sinister." In the context of eye care and prescriptions, OS is commonly used to indicate the left eye specifically, distinguishing it from the right eye, which is abbreviated as "OD" (oculus dexter). This distinction is crucial in various healthcare fields, particularly in optometry and ophthalmology, where precise identification of each eye is necessary for effective evaluation and treatment. Understanding these abbreviations is vital for Patient Care Technicians as they may deal with eye care instructions or documentation that requires accurate communication.