The pupil of the eye is not in the right position, which may be caused by post-cataract surgery complications, or strabismus, glaucoma and other diseases. 1. Post-cataract surgery complications: this disease is mainly caused by lens metabolism disorders, some patients after cataract surgery will appear pupil upward shift, deformation, etc., affecting vision. 2. Strabismus: the etiology of this disease is more complex, which may be related to eye regulation, congenital neuromuscular dysplasia, refractive error, eye trauma, viral infection and other reasons. The main clinical symptom of strabismus is that the pupil of one eye is normal, while the pupil of the other eye deviates from the parallel position, and diplopia, photophobia and other symptoms may also occur. Therefore, the pupil of one eye is not positioned correctly, which may be strabismus. 3. Glaucoma: The etiology of this disease is mainly related to the abnormalities of the structure, depth and size of the anterior chamber, posterior chamber and vitreous cavity of the intraocular cavity, and the common risk factors include history of ocular trauma, myopia or hyperopia, and so on. In some patients, the position of the pupil may be altered due to a shorter axial length of the eye, and patients may also experience headaches and eye swelling. There are a number of causes of malpositioned pupils in the eyes, and a visit to the hospital should be made for a relevant examination.