![]() ![]() 2, 3, 10, 11, 12 To optimize surgical outcomes, wavefront-guided refractive surgery has also been considered. 7, 8, 9 To maximize visual outcome after multifocal IOL implantation, minimizing refractive error is critical and, in some cases, additional surgical procedure are required to reduce remaining refractive error. The Acrysof ReSTOR (Alcon, Inc., Fort Worth, TX, USA), a type of diffractive multifocal IOL, has central apodized diffractive zones and many studies have revealed its usefulness for improving visual performance. The development of the multifocal IOL has been generating increasing interest, as they can provide reasonable vision at both near and distance. Although previously designed IOLs did not pay much attention to correcting higher order aberration, aspheric IOLs were designed with an aspheric surface that induced negative SA that may compensate for corneal SA to improve visual quality. Without compensation of positive corneal SA, the rays of light will fail to focus onto a single spot of the retina and will result in a distortion of the image and compromise of contrast sensitivity. 2, 3, 4, 5, 6 Aberration is the phenomenon by which an image becomes distorted when the lens cannot completely concentrate incoming rays of light into a single focus. The modification of IOL asphericity has been a key focus of IOL development, as adjusting the asphericity of the IOL to corneal spherical aberration (SA) can result in a decrease of total aberration. ![]() Developing interest about the impact of cataract surgery on visual acuity, function, and quality of life has led to the acceleration of the development and refinement of the intraocular lens (IOL). Measuring internal SA with iTrace yields relatively accurate results in all types of IOLs with adequate pupil sizes.Ĭataract surgery involves the extraction of an opaque lens, which leads to improved visual performance. The internal SA of group 1 had a positive value. There were no demographic statistically significant differences among the groups. We compared the internal SAs of these IOLs in pupil sizes of 3, 4, 5, and 6 mm. Total, corneal, and internal SA were measured using iTrace at a 6-mm pupil size in 27 eyes of 27 patients implanted with a monofocal spherical IOL (group 1: Natural, SN60AT), 30 eyes of 30 patients implanted with a monofocal aspheric IOL (group 2: IQ, SN60WF), and 30 eyes of 30 patients implanted with a multifocal aspheric IOL (group 3: ReSTOR, SN6AD1) at 3 months after cataract surgery. To demonstrate the results of the ray tracing-type aberrometer in measuring spherical aberration (SA) in pseudophakic eyes with monofocal intraocular lens (IOL), aspheric monofocal IOL, or aspheric diffractive multifocal IOL. ![]()
1 Comment
10/25/2023 03:10:03 am
Chanel lens replacement services in the UK are readily available at authorized Chanel boutiques and certified optical retailers. Customers seeking lens replacements can visit these establishments to have their Chanel eyewear assessed and fitted with authentic Chanel lenses. It is essential to ensure that only authorized and skilled professionals handle this task to maintain the quality and authenticity of your Chanel glasses. Be sure to check with your local Chanel boutique or reputable optical stores for information on pricing, availability, and specific lens replacement options for your Chanel eyewear.
Reply
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |