The Piggyback IOL procedure involves placing a second Intra-ocular lens, or IOL, over one introduced during regular cataract surgery. A piggyback IOL can help if you need glasses for reading or to perform other activities like driving. Cataract surgery and refractive lens exchange both involve replacing the natural lens with an intra-ocular lens implant. This primary IOL may optimize focus for for a range of distances, or a single distance such as driving. A single focus IOL often provides clear distance vision, but reading and using the computer require the use of glasses. Sometimes, glasses will be required for distance vision. This dependence on glasses can be greatly reduced by placing a very slim IOL, called a Piggyback IOL, just in front of the primary lens. The Piggyback IOL can be: monofocal, to correct distance vision but reading will still require glasses; or multifocal, to give improved vision for distance and reading. Your Ophthalmologist will discuss these options and recommend one of a variety of Piggyback IOLs that suit your needs. The piggyback IOL procedure is comfortable and quick. The eye is numbed and the pupil dilated with drops. The surgeon will make a small opening at the side of the cornea. The Piggyback IOL is placed into the eye and positioned between the iris and the primary IOL. The opening in the cornea is usually self-sealing so sutures are not required.