What does the abbreviation OU stand for in vision terminology?

In vision terminology, the abbreviation "OU" stands for both eyes. This term comes from the Latin phrase "oculus uterque," which translates to "each eye" or "both eyes." It is commonly used in prescriptions and assessments to indicate that a particular instruction or measurement applies to both eyes simultaneously. Understanding the meaning of "OU" is essential for health professionals in the field of vision care as it helps them communicate effectively about vision assessments and the necessary treatment plans for patients. The other options pertain to different aspects of vision assessment but do not accurately represent the meaning of "OU."