YouScience Medical Terminology Practice Test 2026 - Free Medical Terminology Practice Questions and Study Guide

Diplopia is the term for double vision. It combines the Greek roots diplo- meaning double and -opia meaning vision, so it literally describes seeing two images of a single object. This symptom often arises from issues with eye alignment or the nerves and muscles that move the eyes. The other terms don’t relate to vision: diarrhea is a condition of watery stool, diathermy is a heating therapy, and distal means located far from the point of reference in the body.