Effect of residual astigmatism and defocus in eyes with trifocal intraocular lenses

Abstract

To assess the effect on visual function of different residual astigmatic situations combined with 0.50 diopters (D) negative defocus at different distances in patients with trifocal intraocular lenses (IOLs).

Visual Performance of Eyes with Residual Refractive Errors after Implantation of an Extended Vision Intraocular Lens

“…Again, although there was a decrease in VA, it remained ≥1.0 decimal for all situations, so that the clinical impact of the induced astigmatism could be considered as minimal. Previous studies suggested that ATR astigmatisms may be less tolerated than oblique and WTR astigmatisms [ 6 , 13 ]. No direct comparisons can be made with those studies because the current study analyzed a low mixed astigmatism while the others analyzed low myopic astigmatism with trifocal IOLs [ 6 ] or astigmatisms with monofocal IOLs [ 13 ].…”

“…Previous studies suggested that ATR astigmatisms may be less tolerated than oblique and WTR astigmatisms [ 6 , 13 ]. No direct comparisons can be made with those studies because the current study analyzed a low mixed astigmatism while the others analyzed low myopic astigmatism with trifocal IOLs [ 6 ] or astigmatisms with monofocal IOLs [ 13 ]. However, our results suggest that low mixed astigmatisms with the EDoF lens under study are well tolerated regardless of their orientation.…”

“…Both for surgical and visual function procedures, we followed the methods employed in previous works developed in our clinic [ 6 , 7 ]. The study included patients >40 years old that underwent routine cataract surgery and IOL implantation.…”

“…All cataract surgeries were carried out by one experienced surgeon (L.A.R) under topical and intracameral anesthesia, through a 2.2 mm clear-cornea incision at 135 degrees and “stop and chop” phacoemulsification [ 6 , 7 ]. Moreover, IOL implantation was guided by the VERION® System (Alcon Laboratories, Inc, Fort Worth, USA).…”

“…Initially, uncorrected distance (UDVA) , intermediate (UIVA) (60 cm), and near (UNVA) (40 cm) visual acuity were measured with an ETDRS chart at 4 m, followed by subjective refraction. As in previous studies, once the best distance correction was obtained, further VA evaluation procedures were performed with the FrACT3.9.9a version of the Freiburg Acuity Test software package [ 6 , 7 , 11 ].…”