Sensory XT and Sensory ET typically presents after the age of __________.

• A. 3 years old
• B. 4 years old
• C. 5 years old
• D. 7 years old

Answer: (C)

Sensory strabismus happens when vision in one eye is significantly poorer, so the brain can’t fuse the two images reliably. With reduced input from that eye, the eye drifts because fusion is no longer stable. This tends to become evident after several years of unilateral visual impairment, as amblyopia and suppression develop. In practice, sensory exotropia or sensory esotropia most commonly appears around five years of age, making five the typical presentation age. Earlier ages are less common because fusion remains workable in younger children, while a presentation at seven can occur if vision loss develops later.