Strabismus Amblyopia

Strabismus amblyopia is often caused by relatively constant monocular strabismus. Patients with esotropia are more common than patients with exotropia. The main reason may be that early exotropia often presents intermittent characteristics. With strabismus, the visual axes of both eyes are not parallel, and the image of the same object cannot fall on the corresponding point of the retina of both eyes at the same time. Diplopia will be caused by two objects on the non corresponding points of the retina that fall outside the macula of one eye and the macula of the other eye. If the image of another object falls on the macula of the strabismus eye, confusion will be formed. Therefore, strabismus in the early stage will cause diplopia and confusion, making patients feel extremely uncomfortable. In order to reduce discomfort symptoms, the brain will actively produce visual inhibition, forming strabismus amblyopia. Due to the factors of sensory adaptation, the treatment of strabismus amblyopia is more difficult than refractive amblyopia.

1. Clinical symptoms

Young children may not have any symptoms, and older children may complain of blurred vision.

The patient has strabismus, and the inward strabismus is more than the outward strabismus, and the unilateral eye fixation is more than the bilateral alternating fixation. Other examination features are the same as other types of amblyopia.

2. Inspection and diagnosis

The diagnosis of amblyopia must be based on the possible factors that lead to amblyopia in children and exclude all pathological factors that cause vision loss at that time. If children with strabismus occur earlier, it is possible to have strabismus amblyopia during the sensitive period of visual development. Others, such as low vision, eccentric fixation, significant decrease in VEP amplitude, and significant prolongation of the incubation period of each peak, are helpful for diagnosis.