Study of Presbyopia-correcting Intraocular Lenses in Eyes With Previous Corneal Refractive Surgery

Summary

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Description

Recently, the demands for myopia correction and corneal refractive laser surgery are rising with the increased prevalence of myopia. Corneal laser refractive surgery includes photorefractive keratectomy (PRK), laser-assisted in situ keratomileusis (LASIK), laser-assisted subepithelial keratomileusis...

Recently, the demands for myopia correction and corneal refractive laser surgery are rising with the increased prevalence of myopia. Corneal laser refractive surgery includes photorefractive keratectomy (PRK), laser-assisted in situ keratomileusis (LASIK), laser-assisted subepithelial keratomileusis ( LASEK), femtosecond assisted laser in situ keratomileusis (FS-LASIK), and small incision lenticule extraction(SMILE). At present, FS-LASIK and SMILE are the mainstream methods for correcting myopia refractive surgery with advantages of safety, reliability, predictability and stability compared with other types of refractive surgery. Cataract is the most important cause of blindness in my country and even in the world. More than 50% of blind people are caused by cataract. Many patients who have undergone corneal laser refractive surgery may develop presbyopia or cataracts with age. Phacoemulsification and intraocular lens(IOLs) implantation are the main methods for cataract due to lacking effective pharmaceutical treatments. In addition, the patients who use traditional monofocal IOLs without the ability of accommodation may fail to get rid of glasses. Therefore, a solution that can provide both distance vision and near vision is needed to the presbyopia or cataracts patients with previous corneal refractive surgery and accustomed to taking glasses off.The application of presbyopic IOL in cataract after corneal refractive surgery become extensive with the IOL technology continuously advancing, including Extended Depth-of-Focus(EDOF) IOL, multifocal IOL(especially trifocal IOL) and so on, which can improve the distance, middle, and near visual acuity conducing to reduce the rate of wearing glasses after cataract surgery. This project is a single-center, randomized, open, positive product, parallel controlled trial to study the clinical outcomes and applied value of presbyopic IOLs, including EDOF and trifocal IOLs after corneal laser refractive surgery complicated with cataracts, and seek better solutions to enable patients to achieve satisfactory visual quality and refractive results after surgery, culminating in completing patients' demand of taking glasses off.

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