Which potential cause would the nurse associate with eyes not focusing on an object simultaneously and appearing crossed?

Which potential cause would the nurse associate with eyes not focusing on an object simultaneously and appearing crossed?

• A. Impairment of the extraocular muscles
• B. Damage to the optic nerve
• C. Inability to interpret depth cues
• D. Reduced accommodation

Answer: (A)

Coordinated binocular vision depends on the extraocular muscles moving both eyes together so they fixate on the same object. When these muscles are impaired, the eyes can’t align properly, so they may drift toward the midline or away from each other. That misalignment means the eyes aren’t focusing on the same point at the same time, which can cause the appearance of crossing and diplopia. Damage to the optic nerve would affect vision in one eye rather than how the eyes align. An inability to interpret depth cues affects depth perception, not the actual alignment of the eyes. Reduced accommodation changes how the lens focuses on near versus far objects, but it doesn’t typically cause the eyes to deviate and cross.

Coordinated binocular vision depends on the extraocular muscles moving both eyes together so they fixate on the same object. When these muscles are impaired, the eyes can’t align properly, so they may drift toward the midline or away from each other. That misalignment means the eyes aren’t focusing on the same point at the same time, which can cause the appearance of crossing and diplopia.

Damage to the optic nerve would affect vision in one eye rather than how the eyes align. An inability to interpret depth cues affects depth perception, not the actual alignment of the eyes. Reduced accommodation changes how the lens focuses on near versus far objects, but it doesn’t typically cause the eyes to deviate and cross.