Piggyback multifocal intraocular lens for a pseudophakic eye: 6-year follow-up

<h2>Abstract</h2> Because few reports have been published on the long-term observation of piggyback multifocal intraocular lenses (IOLs) for pseudophakic eyes, this study reports a case followed for 6 years after piggyback bifocal IOL implantation. A 42-year-old woman who underwent IOL implantation previously was referred to our hospital with near visual disturbance. She previously underwent cataract surgery with monofocal IOL implantation for emmetropia in her right eye, and she had a cataract in her left eye when she visited our hospital. Her uncorrected visual acuities (UCVAs) for distance were 1.0 logarithm of the minimum angle of resolution (logMAR) that improved to −0.1 logMAR with −2.50 diopter (D): −1.00 D Ax160 in the right eye and 1.1 logMAR that improved to 0.3 logMAR with −4.25 D: −1.50 D Ax10 in the left eye. She expressed a high degree of preference for spectacle independence, and ultimately, cataract surgery with bifocal IOL implantation was performed in the left eye and a piggyback bifocal diffractive optic designed IOL (Add-On Diff-sPB, HumanOptics) was implanted in the right eye. Six years postoperatively, her UCVAs at distance were −0.1 logMAR bilaterally, and 0 logMAR at near (30 cm) with distance correction in both eyes. No postoperative complications developed, and the patient reported satisfaction with her vision, with spectacle independence for daily activities. This case demonstrates the possibility of long-term safety and stability of a piggyback multifocal IOL for a pseudophakic eye. This IOL might be a good option to reduce spectacle dependence for patients after monofocal IOL implantation.