What abbreviation is used for indicating both eyes in prescriptions?

The abbreviation used for indicating both eyes in prescriptions is "OU," which stands for "oculus uterque" in Latin, meaning "each eye" or "both eyes." This term is commonly utilized in ophthalmology and optometry to specify that a medication or treatment should be applied or considered for both eyes.

In the context of vision prescriptions, you may often see "OD" (oculus dexter) for the right eye and "OS" (oculus sinister) for the left eye. However, if a prescription is designed to be applied to both eyes, "OU" is the appropriate abbreviation to convey that instruction, ensuring clear communication about the intended treatment for both eyes simultaneously.

The other options refer to specific conditions for individual eyes or have unrelated meanings, which clarifies why "OU" is the correct choice in this context.