Strabismus definition is:

• A. abnormal deviation of the eye (crossed eyes)
• B. blurred vision in both eyes
• C. color blindness
• D. eye infection

Answer: (A)

Strabismus is when the eyes are not properly aligned; one eye may turn in, out, up, or down while the other eye looks at the target. This misalignment is exactly what the phrase “abnormal deviation of the eye” describes, making it the best fit for the definition. It’s not about blurred vision in both eyes, which points to refractive issues; it isn’t about color perception problems like color blindness; and it isn’t about an infection of the eye. Recognizing misalignment is important because, if unaddressed, it can lead the brain to disregard input from one eye (amblyopia) and can affect depth perception. Treatment focuses on realigning the eyes and promoting binocular vision, through approaches like glasses, vision therapy, or surgery as appropriate.