Final answer:
The lateral rectus muscle is responsible for eye abduction, and dysfunction in this muscle can cause double vision.
Step-by-step explanation:
The lateral rectus muscle is responsible for eye abduction, which is the movement of the eye away from the midline of the face. When the lateral rectus muscle contracts, it pulls the eye outward, allowing it to look towards the side. Dysfunction in this muscle can lead to a condition called lateral rectus palsy, in which the affected eye is unable to move outward properly. This can result in double vision, or diplopia, as the two eyes are not aligned properly.