Eye surgery or operations are performed with the help of phaco method. Phacoemulsification, or phaco, is method of cataract surgery in which the eye's internal lens is emulsified using ultrasonic energy and replaced with an intraocular lens implant, or IOL. In Phaco technique, a small incision is placed in the eye, and a hollow Phaco needle is introduced through the opening. On giving energy through the tip of the Phaco needle, the cataract lens gets dissolved and is sucked out through this needle.