Abstract
Abstract Purpose: To assess long, intermediate and near uncorrected visual acuity after a tetrafocal diffractive intraocular lens implantation, presence of dystopic phenomenon and patient satisfaction after surgery. Methods: Retrospective, observational study performed in Puerta de Hierro Specialties Hospital, in Jalisco, Mexico. That included 100 eyes after phacoemulsification surgery by femtosecond assistance, followed by tetrafocal diffractive intraocular lens implantation due to cataract. Long, intermediate and near visual acuity without correction was measured, and presence or absence of dystopic phenomenon, plus patient satisfaction after surgery. Results: A total of 100 eyes in 50 patients who underwent cataract surgery with phacoemulsification by femtosecond assistance were evaluated. 100% underwent bilateral phacoemulsification. Long, intermediate, and near visual acuity after three months was in the most patients 20/20 (46%), 20/15 (44%) and Jaeger 1 (48%) respectively. The percentage or patients who refers halos was 7%; and other associated symptoms in 18%, being astenopia the most prevalent. The removal of the lens was not required in any case. Conclusion: Tetrafocal diffractive intraocular lenses provides excellent intermediate vision (at 60 centimeters) and satisfactory near (30 centimeters) and long (6 meters) visual acuity.
Highlights
IntroductionTo undertake a visual task in a range of near vision, the eye must be able to focus the light rays at distances closer than infinity
Emmetropia is one of the objectives of modern cataract surgery.(1) The ideal intraocular lens (IOL) would be the one that restores the visual acuity (VA) of the patient, without visual compromise or complications, giving the patient the ability to see at all distances.(2)
Ten patients were operated with a cataract diagnosis (20%) and 40 patients underwent phaco refractive surgery with presbyopia diagnosis (80%). (Figure 1)
Summary
To undertake a visual task in a range of near vision, the eye must be able to focus the light rays at distances closer than infinity In young patients, this process is carried out with an increase in curvature and in the power of the lens. A refractive lens is capable of forming two or more images in the retina, as a result of the density difference in the optics of the lens, associated in turn with changes in the curvature of the surface, many refractive designs include continuous changes between zones and effectively in two or more optical zones to focus light at several distances (multifocality), with the potential ability to provide functional vision regardless of distance.(3).
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