Lasik eye surgery: Although this procedure is an effective way to correct vision, it is considered an elective surgery, so it is generally not covered by insurance. Owing to the high cost, many patients seek treatment from less-than-reputable doctors who perform the surgery at a lower cost. Glaucoma: This occurs when there is a buildup of pressure in the fluid that fills the eye. Malpractice occurs when a doctor fails to diagnose glaucoma, which can cause the patient to suffer permanent loss of vision. Cataracts: Although cataract surgery is very common, it is also associated with the most errors. This is largely because doctors have become so comfortable diagnosing cataracts and performing cataract surgery that they are not always as careful as they should be.