Trifocal toric intraocular lenses in eyes with low amount of corneal astigmatism

AIM:To evaluate the refractive and visual outcomes following cataract surgery and implantation of a trifocal toric intraocular lens(IOL)in eyes with low degrees of corneal astigmatism.METHODS:Twenty-six eyes of 22 patients who underwent implantation a trifocal toric IOL(FineVision PODFT,PhysIOL s.a.,Liege,Belgium)were enrolled.Phacoemulsification with femtosecond laser,capsular tension ring insertion and intraoperative aberrometry were performed in all cases.All IOLs used showed a cylinder power of 1.00 D.Main outcome measures were refractive error and corrected-distance visual acuity(CDVA)and uncorrected-distance visual acuity(UDVA)values.Eyes were evaluated at 4 mo post-surgery.RESULTS:Totally 50%of eyes showed a spherical equivalent(SE)within±0.13 D and all of them within±0.50 D.The mean SE and refractive cylinder were-0.02±0.23 and-0.16±0.22 D,respectively.Vector analysis revealed that 100%of eyes were within±0.50 D for the SE and cylindrical components(J0 and J45).Refractive changes were not correlated with keratometric changes(P>0.05)showing that the reduction in astigmatism comes from the trifocal toric IOL.Of 81%and 96%of eyes showed UDVA and CDVA of 20/20,respectively.The postoperative mean values of monocular distance Snellen decimal UDVA and CDVA were 0.97±0.05 and 0.99±0.02(about 20/20),respectively.CONCLUSION:Our study suggests that the use of this trifocal toric IOL in patients with low amount of astigmatism provides accurate refractive outcomes and enables them to achieve excellent visual acuity.

In vivo optical quality of posterior-chamber phakic implantable collamer lenses with a central port

Background: The aim of this review is to summarize the optical quality results in patients following theimplantation of the V4c implantable collamer lens with a central port (ICL, STAAR Surgical Inc.).Main text: A literature search in several databases was carried out to identify those publications, both prospective,retrospective and/or comparative with other refractive surgery procedures, reporting optical outcomes of patientswho were implanted with the V4c ICL model. A total of 17 clinical studies published between 2012 and 2021 wereincluded in this review. A detailed analysis of the available data was performed including number of eyes, follow-upand preoperative spherical equivalent. Specifically, the review focused on several optical parameters includinghigher-order aberrations (HOAs), modulation transfer function (MTF) cut-off frequency and Strehl ratio. This reviewencompassed a total of 817 eyes measured using different optical devices based on Hartmann-Shack, retinal imagequality measurement and ray-tracing technologies at different follow-ups.Conclusions: The outcomes found in this review lead us to conclude that the ICL V4c model provides good opticalquality, by means of different metrics, when implanted.

In vivo optical quality of posterior-chamber phakic implantable collamer lenses with a central port

Background:The aim of this review is to summarize the optical quality results in patients following the implantation of the V4c implantable collamer lens with a central port(ICL,STAAR Surgical Inc.).Main text:A literature search in several databases was carried out to identify those publications,both prospective,retrospective and/or comparative with other refractive surgery procedures,reporting optical outcomes of patients who were implanted with the V4c ICL model.A total of 17 clinical studies published between 2012 and 2021 were included in this review.A detailed analysis of the available data was performed including number of eyes,follow-up and preoperative spherical equivalent.Specifically,the review focused on several optical parameters including higher-order aberrations(HOAs),modulation transfer function(MTF)cut-off frequency and Strehl ratio.This review encompassed a total of 817 eyes measured using different optical devices based on Hartmann-Shack,retinal image quality measurement and ray-tracing technologies at different follow-ups.Conclusions:The outcomes found in this review lead us to conclude that the ICL V4c model provides good optical quality,by means of different metrics,when implanted.