Causes include blindness in one eye, amblyopia and strabismus. Far-sightedness can have rare complications such as strabismus and amblyopia. However, a constant unilateral strabismus causing constant suppression is a risk for amblyopia in children. Frequently, amblyopia is associated with a combination of anisometropia and strabismus. Glaucoma, nystagmus, scotoma, or strabismus may also occur. Ocular abnormalities include limbal dermoids, strabismus. It is frequently used for detecting amblyopia, strabismus and suppression, and for assessing stereoacuity. These are forms of strabismus that can be accompanied by amblyopia. Additionally, children with PVL often exhibit nystagmus, strabismus, and refractive error. These studies opened the door for the understanding and treatment of childhood cataracts and strabismus. Vision loss can occur and is associated with strabismus, refractive errors, and anisometropia. Acquired non-accommodative strabismus and secondary strabismus are developed after normal binocular vision has developed. Symptoms of strabismus include double vision and/or eye strain. Surgery or patching are usually necessary to treat strabismus if diagnosed early. Strabismus surgery was performed later if required.