Ocular wavefront analysis of aspheric compared with spherical monofocal intraocular lenses in cataract surgery: Systematic review with metaanalysis

Schuster, Alexander K.; Tesarz, Jonas; Vossmerbaeumer, Urs

doi:10.1016/j.jcrs.2015.04.005

Cited by 44 publications

(29 citation statements)

References 33 publications

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“…Current cataract surgery with IOL implantation is already highly successful – the use of an IOL instead of aphakia glasses was the major improvement. The majority of patients reach a normal visual acuity with spherical IOLs, and with aspheric IOLs, they reach visual acuity and contrast sensitivity values similar to that of young, healthy subjects . This suggests that IOL customisation might be of limited importance.…”

Section: Discussionmentioning

confidence: 96%

“…The majority of patients reach a normal visual acuity with spherical IOLs, and with aspheric IOLs, they reach visual acuity and contrast sensitivity values similar to that of young, healthy subjects. 24,32 This suggests that IOL customisation might be of limited importance. However, similar to toric IOLs being really beneficial for those with high corneal astigmatism, 33,34 further customisation may be very useful for those with an above-average amount of other higher-order aberrations.…”

Section: Discussionmentioning

confidence: 99%

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From corneal shape to ocular wavefront in eyes with aspheric IOLs: the feasibility of IOL customisation

Jong

Cánovas

Weeber

et al. 2015

Ophthalmic Physiologic Optic

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Purpose: To determine if it is possible to predict the ocular wavefront aberrations of eyes with an aspheric IOL from the corneal shape and other readily available eye characteristics. A reliable prediction is a prerequisite for future IOL customisation. Methods: Sixty pseudophakic eyes with aspheric IOLs of 60 patients were included. The corneal shape and the ocular wavefront aberrations were measured postoperatively with a Scheimpflug camera and an aberrometer, respectively. The elevation data of the anterior corneal surface were fitted by Zernike polynomials. Linear regression models for the Zernike coefficients describing the ocular wavefront aberrations up till the fourth order were determined, with as independent variables the Zernike coefficients describing the corneal shape, the eye (right/left), IOL power, and axial length. Results: Linear regression equations with an explained variance (adjusted R-square) above 0.50 were found for five Zernike aberration terms: defocus (z (2,0); adjusted R-square 0.90), the astigmatism terms (0.81 for oblique astigmatism [z(2,À2)] and 0.88 for regular astigmatism [z(2,2)]), vertical coma (z(3,À1); 0.52), and spherical aberration (z(4,0); 0.71). Conclusion: The defocus, astigmatism, vertical coma, and spherical aberration terms of the ocular wavefront are strongly associated with the corneal shape in pseudophakic eyes and may thus be predicted from the corneal shape and other eye characteristics.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

From corneal shape to ocular wavefront in eyes with aspheric IOLs: the feasibility of IOL customisation

Jong

Cánovas

Weeber

et al. 2015

Ophthalmic Physiologic Optic

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“…In normal corneas, the anterior surface has positive spherical aberration and the focal point of peripheral rays lies in front of the focal point of central rays. [ 9 ] The aspheric IOL was designed with an aspheric surface that induced negative spherical aberrations and offset positive spherical aberration derived from the anterior cornea. The reduction of spherical aberration after aspheric IOL implantation has been shown to improve vision and contrast sensitivity compared with those of the spherical IOL implantation.…”

Section: Discussionmentioning

confidence: 99%

The efficiency of aspheric intraocular lens according to biometric measurements

et al. 2017

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PurposeTo analyze internal spherical aberration in pseudophakic eyes that underwent aspheric intraocular lens (IOL) implantation, and to investigate the relationships between biometric data and the effectiveness of aspheric IOL implantation.MethodsThis retrospective study included 40 eyes of 40 patients who underwent implantation of an IOL having a negative spherical aberration of -0.20 μm (CT ASPHINA 509M; Carl Zeiss Meditec Inc., Germany). The IOLMaster (version 5.0; Carl Zeiss AG, Germany) was used for preoperative biometric measurements (axial length, anterior chamber depth, central corneal power) and the measurement of postoperative anterior chamber depth. The spherical aberrations were measured preoperatively and 3 months postoperatively using the iTrace (Tracey Technologies, Houston, TX, USA) at a pupil diameter of 5.0 mm. We investigated the relationships between preoperative biometric data and postoperative internal spherical aberration, and compared biometric measurements between 2 subgroups stratified according to internal spherical aberration (spherical aberration ≤ -0.06 μm vs. spherical aberration > -0.06 μm).ResultsThe mean postoperative internal spherical aberration was -0.087 ± 0.063 μm. Preoperative axial length and residual total spherical aberration showed statistically significant correlations with internal spherical aberration (p = 0.041, 0.002). Preoperative axial length, postoperative anterior chamber depth, IOL power, and residual spherical aberration showed significant differences between the 2 subgroups stratified according to internal spherical aberration (p = 0.020, 0.029, 0.048, 0.041 respectively).ConclusionThe corrective effect of an aspheric IOL is influenced by preoperative axial length and postoperative anterior chamber depth. Not only the amount of negative spherical aberration on the IOL surface but also the preoperative axial length should be considered to optimize spherical aberration after aspheric IOL implantation.

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“…C urrently in cataract surgery, the opacified crystalline lens is replaced by a monofocal intraocular lens (IOL) with a power targeted to achieve emmetropia. The main optical difference between monofocal designs is the values of spherical aberration [1][2][3] ; some with spherical surfaces induce positive values and others with aspheric surfaces induce neutral or negative values of spherical aberration to compensate for total or partially corneal values. 4,5 To achieve clear vision at different viewing distances, multifocal IOLs 6 have become the customary choice in cataract surgery.…”

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confidence: 99%

Effect of Crystalline Lens Aberrations on Adaptive Optics Simulation of Intraocular Lenses

Villegas¹,

Manzanera²,

Lago³

et al. 2019

J Refract Surg

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PURPOSE:To evaluate the impact of the lens aberrations on the adaptive optics visual simulation of pseudophakic intraocular lens (IOL) profiles. METHODS:In 20 right phakic eyes, lens higher order aberrations (HOAs) were calculated as the whole eye minus the corneal aberrations. Visual simulation using low and high contrast corrected distance visual acuity (CDVA) testing was carried out with the VAO instrument (Voptica, SL, Murcia, Spain), considering three optical conditions of the lens: removing HOA (no lens-HOA), removing spherical aberration (no lens-SA), and with lens HOA (natural condition). In addition, a through-focus visual simulation of a trifocal diffractive IOL profile with high contrast CDVA was also measured in two conditions: no lens-HOA and natural condition. Three different pupil sizes (3, 4.5, and 6 mm) were tested for all conditions. RESULTS: There were no significant intersubject differences between the three optical conditions and in the IOL simulation for all pupil sizes (P > .05). For 4.5-and 6-mm pupils, mean VA values of the no-lens SA and no lens-HOA conditions were similar and slightly worse than those of the natural condition. Individual differences between the no lens-HOA condition and the other two optical conditions, estimated as 95% limits of agreement, were acceptable for 3-mm pupil but worse as pupil diameter increased. CONCLUSIONS:The effect of lens aberrations on visual simulation is imperceptible for a small pupil diameter of 3 mm. Although the increment of pupil size increases the probability of patients with significant visual impact of lens HOAs, the mean intersubject VA differences are negligible.

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Ocular wavefront analysis of aspheric compared with spherical monofocal intraocular lenses in cataract surgery: Systematic review with metaanalysis

Cited by 44 publications

References 33 publications

From corneal shape to ocular wavefront in eyes with aspheric IOLs: the feasibility of IOL customisation

From corneal shape to ocular wavefront in eyes with aspheric IOLs: the feasibility of IOL customisation

The efficiency of aspheric intraocular lens according to biometric measurements

Effect of Crystalline Lens Aberrations on Adaptive Optics Simulation of Intraocular Lenses

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