Eyeworld

Supported by an unrestricted educational grant from Abbott Medical Optics uses diffractive technology to improve visual quality by actively correcting chromatic aberration, so the depth of field can be extended while maintaining visual quality comparable to a monofocal. Spherical Aberration Eye Cornea Lens Spherical aberration decreases image quality + = Zero SA Positive SA Negative SA Figure 1. Minimizing spherical aberration maximizes image quality. Chromatic Aberration + = = IOL materials affect Chromatic Aberration Dispersion Dispersion High Index High Dispersion Material Mid Index Low Dispersion Material Cornea IOL Eye Figure 2. IOL materials affect the chromatic aberration of the pseudophakic eye. Maximizing visual quality Until IOLs provide true accommodation, there will always be tradeoffs. Visual quality should be considered primarily, but the balance of depth of field and night vision symptoms should also be taken into account. As industry continues to provide good options, sur- geons are better equipped to find the best set of tradeoffs to satisfy our patients. With an expanding range of options, we can help more patients to make presbyopia a thing of the past. References 1. Chang DH, et al. Intraocular lens optics and aberrations. Curr Opin Ophthalmol. 2016;27:298–303. 2. Zhao H, et al. The effect of chro- matic dispersion on pseudophakic optical performance. Br J Ophthalmol. 2007;91:1225–1229. 3. Negishi K, et al. Effect of chromatic aberration on contrast sensitivity in pseudophakic eyes. Arch Ophthalmol. 2001;119:1154–1158. 4. Cochener B, et al. Clinical outcomes of a new extended range of vision intraocular lens: International Mul- ticenter Concerto Study. J Cataract Refract Surg. 2016;42:1268–1275. 5. Pepose JS, et al. A prospective randomized clinical evaluation of 3 presbyopia-correcting intraocular lenses after cataract extraction. Am J Ophthalmol. 2014;158:436–446. 6. Jardim D, et al. Asymmetric vault of an accommodating intraocular lens. J Cataract Refract Surg. 2006;32:347– 350. Dr. Chang is in private prac- tice with Empire Eye and Laser Center, Bakersfield, California. He can be contacted at dchang@ empireeyeandlaser.com. Hyper-aspheric and pinhole designs are under investiga- tion as well. The current generation of IOLs labeled as "accom- modating" provides far and intermediate vision, but near vision is limited. 5 It does not provide spherical aberration correction, and its chromatic aberration properties are not particularly good. Additional- ly, predictability and long- term positional stability in the eye are concerns. 6 5

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