Patients with strabismus often exhibit symptoms of double vision in the early stages of the condition. Strabismus is a common ophthalmologic disease characterized by non-parallel visual directions of the eyes and uncoordinated eyeball movements. When one eye looks straight ahead at a target, the visual direction of the other eye may deviate. Based on the direction of deviation, strabismus can be further divided into types such as esotropia, exotropia, and vertical strabismus. Due to the inconsistent visual directions of both eyes in strabismus patients, the scenes viewed by each eye are different. The brain cannot merge the different views from both eyes, resulting in the appearance of double vision symptoms. The more severe the symptoms of strabismus, the more pronounced the symptoms of double vision typically are, and strabismus can be treated surgically to eliminate symptoms.