Certified Paraoptometric (CPO) Practice Exam 2025

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What does "Aniso-" imply in medical terms?

Without
To, toward
Different
Away

The correct answer is: Different

"Aniso-" is a prefix used in medical terminology that signifies "different" or "unequal." It often appears in contexts such as "anisocoria," which refers to unequal pupil sizes, or "anisometropia," which describes a condition where there is a significant difference in the refractive power of the two eyes. Therefore, the choice highlighting "different" is accurate, as it captures the essence of the prefix "aniso-" in indicating a lack of uniformity or equality in medical conditions. The other options, while they do provide essential meanings in medical terminology, do not relate to the definition of "aniso-." For example, "without" conveys the absence of something, "to, toward" indicates direction, and "away" suggests a distancing from something, none of which align with the concept of "difference" inherent in the use of "aniso-."