Evaluation of the optical performance for aspheric intraocular lenses in relation with tilt and decenter errors

Pérez-Gracia, Jesús; Varea, Alejandra; Ares, Jorge; Vallés, Juan A.; Remón, Laura

doi:10.1371/journal.pone.0232546

Cited by 31 publications

(38 citation statements)

References 31 publications

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“…on-axis MTF values obtained for Navarro's eye model, results with the myopic cornea were lower for all the IOL designs. Regarding the optical quality behaviour of the lenses with tilt, we observed what it was known already: MTF degradation was less dependent on the IOL design [12]. The tendency followed in the MTF degradation with tilt was similar for all lenses, varying the initial on-axis MTF value in relation to the studied cornea.…”

Section: Plos Onesupporting

confidence: 77%

“…The aspheric surfaces used to model the different IOLs take the form of a rotationally symmetric conic cross-section (see more details in Ref. [ 12 ]). Lens A was an IOL with negative fourth-order Zernike SA ( ) to totally compensate for the fourth-order Zernike positive SA ( ) of the Navarro cornea (SA = 0.139 μm at a 6.00 mm entrance pupil diameter).…”

Section: Methodsmentioning

confidence: 99%

“…There are different aspheric IOL designs in the market, which induce different spherical aberration ( ) (SA) values: 1) IOLs with negative SA to compensate for the average positive SA of the human cornea (approximately 0.27 μm) [ 10 ], 2) IOLs that correct the corneal SA leaving a slightly positive total ocular SA [ 4 ], and 3) aberration-free IOLs that are designed so that the SA of the isolated lens is corrected [ 11 ]. On one hand, several studies [ 4 , 6 , 12 ] have demonstrated that aspherical IOLs are more sensitive than spherical IOLs to misalignment or tilt, depending on their SA correction; i.e., the image quality in the presence of IOL misalignment is more degraded for IOL designs with a higher amount of negative spherical aberration ( ). However, the effect of tilt on the optical performance was less sensitive to the IOL design.…”

Section: Introductionmentioning

confidence: 99%

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Misalignment and tilt effect on aspheric intraocular lens designs after a corneal refractive surgery

et al. 2020

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Purpose To numerically evaluate and compare the tolerance to misalignment and tilt of aspheric intraocular lenses (IOLs) designed for three eyes: with standard cornea and with simulated corneas after myopic and hyperopic laser ablation surgery. Methods Three aspheric IOLs of +20.00 diopter (D) with different spherical aberration (SA) (Z40) values have been designed using a theoretical model eye. Drastic changes on the theoretical eye anterior corneal asphericity have been performed to simulate myopic and hyperopic refractive surgeries. The effect of IOL misalignment and tilt on the image quality has been evaluated using a commercial optical software design for the three eye models. Image quality was assessed from the modulation transfer function (MTF), root mean square (RMS) values of defocus, astigmatism, coma and spherical aberration (Z40), and retinal images obtained from a visual simulator using an aleatory optotype of 0.00 LogMar visual acuity (VA). Results IOL misalignment and tilt reduced MTF values in general, and increased wavefront aberrations errors. Aberration-free IOLs maintained best the MTF values when misalignments were applied, together with good on-axis optical quality. IOLs with negative SA (Z40) correction decreased the MTF value under 0.43 for misalignments values higher than 0.50 mm with the three corneas. The effect of misalignment on RMS astigmatism and coma was correlated with the IOL SA (Z40) and with the three corneas. Conclusions This theoretical study shows that the largest degradation in image quality arises for the IOL with the highest amount of spherical aberration (Z40). Moreover, it has been found that the aspherical design has a more influential role in misalignment tolerance than in tilt tolerance.

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Section: Plos Onesupporting

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Misalignment and tilt effect on aspheric intraocular lens designs after a corneal refractive surgery

et al. 2020

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“…In fact, the higher quantities of spherical aberration correction were associated with a greater optical degradation. Contrarily, the effect of tilt on optical performance was less sensitive to the IOL design in the clinically typical range of tilt errors evaluated [ 60 ].…”

Section: Measurement Of Iol Tilt and Decentrationmentioning

confidence: 99%

Effect of Intraocular Lens Tilt and Decentration on Visual Acuity, Dysphotopsia and Wavefront Aberrations

Ashena

Maqsood

Ahmed

et al. 2020

Vision

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Tilt and decentration of intraocular lenses (IOL) may occur secondary to a complicated cataract surgery or following an uneventful phacoemulsification. Although up to 2–3° tilt and a 0.2–0.3 mm decentration are common and clinically unnoticed for any design of IOL, larger extent of tilt and decentration has a negative impact on the optical performance and subsequently, the patients’ satisfaction. This negative impact does not affect various types of IOLs equally. In this paper we review the methods of measuring IOL tilt and decentration and focus on the effect of IOL tilt and decentration on visual function, in particular visual acuity, dysphotopsia, and wavefront aberrations. Our review found that the methods to measure the IOL displacement have significantly evolved and the available studies have employed different methods in their measurement, while comparability of these methods is questionable. There has been no universal reference point and axis to measure the IOL displacement between different studies. A remarkably high variety and brands of IOLs are used in various studies and occasionally, opposite results are noticed when two different brands of a same design were compared against another IOL design in two studies. We conclude that <5° of inferotemporal tilt is common in both crystalline lenses and IOLs with a correlation between pre- and postoperative lens tilt. IOL tilt has been noticed more frequently with scleral fixated compared with in-the-bag IOLs. IOL decentration has a greater impact than tilt on reduction of visual acuity. There was no correlation between IOL tilt and decentration and dysphotopsia. The advantages of aspheric IOLs are lost when decentration is >0.5 mm. The effect of IOL displacement on visual function is more pronounced in aberration correcting IOLs compared to spherical and standard non-aberration correcting aspherical IOLs and in multifocal versus monofocal IOLs. Internal coma has been frequently associated with IOL tilt and decentration, and this increases with pupil size. There is no correlation between spherical aberration and IOL tilt or decentration. Although IOL tilt produces significant impact on visual outcome in toric IOLs, these lenses are more sensitive to rotation compared to tilt.

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“…Liu and associates found the misalignment of a multifocal IOL markedly decreased the visual quality [36]. Pérez-Gracia and associates found the misalignment of aspheric IOLs could increase the ocular aberrations and affect the MTF [37]. Taketani and associates found there was a stong correlation between coma and IOL tilt [38].…”

Section: ]mentioning

confidence: 98%

Short-time evaluation on intraocular scattering after implantable collamer lens implantation for correcting high myopia

Song

2020

BMC Ophthalmol

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Background: To compare the intraocular scattering before and after implantation of implantable collamer lens (ICL) V4c for correction of high myopia in a short term. Methods: In this study, 38 eyes of 19 patients who underwent the implantation of ICL V4c were followed up for 3 months. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), objective scattering index (OSI), modulation transfer function cutoff frequency (MTF cutoff), strehl ratio (S/R), OV100%, OV20% and OV9% were measured pre-and postoperatively. Meantime, the Pseudophakic Dysphotopsia Questionnaire (PDQ) was scored to evaluate the subjective satisfaction of intraocular scattering pre-and postoperatively. Results: The UCVA were − 0.02 ± 0.06, − 0.03 ± 0.07 and − 0.04 ± 0.07 logMAR at 1 week, 1 month and 3 months postoperatively which were significantly better than those preoperatively (P < 0.05). The BCVA were − 0.09 ± 0.09, − 0.09 ± 0.1 and − 0.1 ± 0.11 logMAR at 1 week, 1 month and 3 months after surgery, which were better than those before surgery significantly (t = 15.64, P < 0.05). The mean OSI were 2.37 ± 1.6, 1.63 ± 0.94, 1.5 ± 0.86 and 1.43 ± 1.05 preoperatively, 1 week, 1 month and 3 months postoperatively which was found significant difference (F = 12.92 P < 0.05). No significant differences were found in MTF cut off (F = 0.61, P = 0.62), S/R (F = 0.58, P = 0.36), OV100% (F = 0.966, P = 0.65), OV20% (F = 0.121, P = 0.96) and OV9% (F = 1.01, P = 0.30) between pre-and postoperatively. The PDQ results indicated that intraocular scattering reduced at 3 months after surgery significantly (P < 0.05). Conclusions: The ICL V4c implantation for correcting high myopia induced less intraocular scattering and visual disorder than spectacle correction.

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Evaluation of the optical performance for aspheric intraocular lenses in relation with tilt and decenter errors

Cited by 31 publications

References 31 publications

Misalignment and tilt effect on aspheric intraocular lens designs after a corneal refractive surgery

Misalignment and tilt effect on aspheric intraocular lens designs after a corneal refractive surgery

Effect of Intraocular Lens Tilt and Decentration on Visual Acuity, Dysphotopsia and Wavefront Aberrations

Short-time evaluation on intraocular scattering after implantable collamer lens implantation for correcting high myopia

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