What methods are available to restore vision depends on the cause of vision loss. If it is caused by refractive error, it is recommended to wear glasses, including frame glasses, contact lenses, keratoplasty, or perform surgical treatment. If it is an eye disease, it depends on what is causing it, such as keratitis, which is bacterial, viral or fungal, and anti-inflammatory, anti-viral and anti-fungal treatments can be given. Iritis is usually treated with dilated pupils, anti-inflammatory, and hormones. Glaucoma should be treated by lowering the intraocular pressure, and in case of closed-angle glaucoma, pupil reduction therapy and nerve nutrition should be given. Cataracts can be treated surgically by extracapsular extraction with IOL implantation or ultrasonic emulsification with IOL implantation. Fundus disease should be treated for its cause.