Phacoemulsification is a technique used to perform cataract surgery and treat the condition known as cataracts. In patients with cataracts, the lens of the eye becomes clouded, making it difficult for the patient to see. In cataract surgery, the doctor replaces the clouded lens with an artificial replacement. When using the technique of phacoemulsification, the doctor can use an ultrasonic probe to emulsify the lens, remove the fragments, and then insert the replacement. One kind of replacement lens is the IQ IOL (IntraOcular Lens).