It is never too late for strabismus surgery. The success rate of an adult is the same as that of a child. Intervention can achieve better symmetry in the eyes and therefore improve the patient’s cosmetic appearance and quality of life. It is important to bear in mind, however, in the case of lazy eye, surgery will not improve vision, since the period for optimum visual development is from birth up to approximately age 8-9. Eyesight that hasn’t fully developed in childhood cannot be restored in adulthood.