Ophthalmic surgery is a specialty within the field of ophthalmology. It involves the detection and surgical or laser treatment of eye and eyesight diseases and injuries. These include cataracts and glaucoma, diseases of the cornea (and also transplants), the removal of tumours and foreign bodies, diseases of the lens, retinal diseases or injuries, lesions of the eye muscles, disorders of the tear ducts, eyelids or eye sockets, and so on. It also includes vision correction surgery (e.g. squints).