Ophthalmic surgery also known as ocular surgery is performed in the eye to treat a condition or a disease by an ophthalmologist. There are many types of ophthalmic surgery which includes corrective surgery-which is used to correct or treat a disorder. Phacoemulsification is a cataract surgery in which the internal lens in the eye is modified. Glaucoma surgery is done to decrease the production of intraocular fluid. Orbital surgery is specially considered with the eyelids or orbit and the lacrimal system.