Which term corresponds to "emmetr/o"?

The term "emmetr/o" refers to a condition of being correct or normal, particularly in the context of vision. It is derived from Greek roots, where "emmetris" means "in proper measure" or "correct." This term is often used in ophthalmology to discuss a state of normal vision, indicating that a person's eyesight is well-balanced and does not require correction, such as glasses or contact lenses.

In contrast, the other options relate to different concepts: "defective" implies an imperfection or fault, "excessive" refers to something that is more than necessary, and "abnormal" describes a condition that deviates from the norm. Therefore, the choice that aligns with the meaning of "emmetr/o" is indeed one that signifies correctness or proper function.