**Core Concept:** Dextroversion or rightward deviation of the eyeball occurs due to the excessive activity of the extraocular muscles, particularly the superior rectus (SR) and the inferior oblique (IO) muscles. The antagonist muscles, inferior rectus (IR) and the superior oblique (SO) muscles, are relatively inactive or not involved.

**Why the Correct Answer is Right:** Dextroversion is the result of an imbalance between the forces exerted by the SR and IO muscles, which pull the eyeball to the right, and the forces exerted by the IR and SO muscles, which pull the eyeball towards the left. In a normal situation, these muscles work in a coordinated manner to maintain eye alignment.

**Why Each Wrong Option is Incorrect:**

A. The explanation for this option is missing.
B. The explanation for this option is missing.
C. The explanation for this option is missing.
D. The explanation for this option is missing.

**Clinical Pearl:** Understanding eye muscle imbalances is essential for diagnosing and treating strabismus, a condition where the eyes do not align properly. In strabismus, the balance of ocular muscle forces is disrupted, leading to abnormal eye movements and deviation.

**Correct Answer:** .