Wavefront and Visual Function Analysis After Aspherical and Spherical Intraocular Lenses Implantation

Hyunseok Ahn; Sun Woong Kim; Eung Kweon Kim; Tae-im Kim

doi:10.3341/jkos.2008.49.8.1248

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Ahn, Kim, Kim, and Kim: Wavefront and Visual Function Analysis After Aspherical and Spherical Intraocular Lenses Implantation

Original Article

J Korean Ophthalmol Soc 2008;49(8):1248-1255.

Published online: 7 September 2008

DOI: https://doi.org/10.3341/jkos.2008.49.8.1248

Wavefront and Visual Function Analysis After Aspherical and Spherical Intraocular Lenses Implantation

Hyunseok Ahn, M.D.¹, Sun Woong Kim, M.D.², Eung Kweon Kim, M.D., Ph.D.¹, Tae-im Kim, M.D.¹

Vision Research Institute, Department of Ophthalmology, Yonsei University College of Medicine¹, Seoul, Korea

Department of Ophthalmology, Soonchunhyang University College of Medicine, Bucheon, Korea

Address reprint requests to Tae-im Kim, M.D. Department of Ophthalmology, EYE&ENT Hospital, Younsei University Medical Center #134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Korea Tel: 82-2-2228-3570, Fax: 82-2-312-0541, E-mail: tikim@yuhs.ac

Received 15 April 2008 Accepted 9 January 2008

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To compare postoperative wavefront aberration and visual functions between aspherical Tecnis Z9003, a new acrylic aspheric intraocular lens (IOL), and spherical AcrySof SA60AT IOL.

Methods

Fifty patients (56 eyes) who underwent cataract extraction and were implanted with spherical or aspherical IOLs were randomly evaluated by wavefront analysis, including an examination of spherical aberration and higher-order aberrations using two different types of aberrometers (ray tracing and automatic retinoscope), manifested refraction, a contrast sensitivity test, and modulation transfer function (MTF), three months after surgery.

Result

There were no statistically significant differences of spherical equivalent and best-corrected visual acuity between the two different IOL groups. However, the aspherical IOL group showed less spherical aberration and better contrast sensitivity and MTF than the spherical IOL group.

Conclusions

Tecnis Z9003 could compensate for positive spherical aberrations of the cornea and improve contrast sensitivity and MTF, thereby improving visual function.

Keywords: Aspheric intraocular lens, Contrast sensitivity, Modulation transfer function, Spherical aberration, Visual function

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Figure 1.

Ocular and internal aberrations of spherical and aspherical IOL-implanted groups at 4-mm pupil zone ^† RMS Total=root mean measured by iTrace. (* p<0.05; square of total aberrations; ^‡ RMS HoA=root mean square of ^§ 7th total higher-order aberrations from 3rd to 6th order; ^＃ SA=spherical ^∏8th coma aberration; coma aberration; aberration)

Figure 2.

Ocular and internal aberrations of spherical and aspherical IOL implanted groups at 6-mm pupil zone ^†: RMS Total=root mean measured by iTrace. (* p<0.05; ^‡ RMS HoA=Root mean square square of total aberrations; ^§ 7th of total higher order aberrations from 3rd to 6th order; ^＃ SA=spherical ^∏8th coma aberration; coma aberration, aberration)

Figure 3.

Ocular and internal aberrations of spherical and aspherical IOL implanted groups at 4 mm pupil zone measured by OPD scan. (* p<0.05; RMS Total=root mean square of total aberrations; ^‡ RMS HoA=root mean square of ^§ 7th total higher order aberrations from 3rd to 6th order; ^＃ SA=spherical ^∏8th coma aberration; coma aberration; aberration).

Figure 4.

Ocular and internal aberrations of spherical and aspherical IOL implanted groups at 6-mm pupil zone measured by OPD scan. (* p<0.05; ^† RMS Total = root mean ^‡RMS HoA = root mean square square of total aberrations; ^§ 7th of total higher order aberrations from 3rd to 6th order; ^＃ SA=spherical ^∏8th coma aberration; coma aberration; aberration).

Figure 5.

Contrast sensitivity test result of spherical and aspherical IOL-implanted groups in mesopic condition (* p<0.05).

Figure 6.

Contrast sensitivity test result of spherical and aspherical IOL-implanted groups in photopic condition (* p<0.05).

Figure 7.

Modulation transfer function (MTF) of spherical and aspherical IOL implanted groups at 6-mm pupil zone (* p<0.05).

Table 1.

Comparison of sex, age, manifest refraction, BCVA between spherical IOL-implanted group and aspherical IOL- implanted group

	Spherical	Aspherical	P
Sex (M:F)	12:17	10:11
Age	61.30±13.69	59.43±15.32	0.634
MR* (SE^†)	-0.39±0.91	-0.70±0.53	0.151
BCVA^‡(logMAR)	0.08±0.17	0.04±0.08	0.290

^* MR=manifest refraction;

^† SE=spherical equivalent;

^‡ BCVA=best corrected visual acuity.

Table 2.

Comparison of ocular and internal aberrations measured by iTrace aberrometer between spherical IOL-implanted group and aspherical IOL-implanted group

Optic zone		Zernike’s coefficients	Spherical	Aspherical	p
4 mm	ocular aberration	RMS Total^†	0.601±0.339	0.671±0.485	0.527
		RMS HoA^‡	0.306±0.163	0.360±0.279	0.410
		coma 7	-0.098±0.122	0.041±0.155	0.000*
		coma 8	0.024±0.124	0.049±0.104	0.430
		SA^§	0.114±0.062	-0.002±0.073	0.000*
	Internal aberration	RMS Total	0.532±0.243	0.522±0.277	0.892
		RMS HoA	0.268±0.142	0.325±0.259	0.341
		coma 7	-0.115±0.106	0.008±0.119	0.000*
		coma 8	0.008±0.085	0.023±0.104	0.568
		SA	0.040±0.039	-0.058±0.066	0.000*
6 mm	ocular aberration	RMS Total	1.783±0.812	2.000±1.364	0.527
		RMS HoA	1.256±0.687	1.334±1.050	0.773
		coma 7	-0.348±0.429	-0.098±0.459	0.055
		coma 8	0.174±0.338	0.041±0.419	0.220
		SA	0.516±0.339	-0.048±0.292	0.000*
	Internal aberration	RMS Total	1.566±0.901	1.536±1.047	0.914
		RMS HoA	1.065±0.723	1.320±1.008	0.336
		coma 7	-0.303±0.450	-0.113±0.329	0.111
		coma 8	0.126±0.335	0.010±0.419	0.286
		SA	0.169±0.275	-0.328±0.257	0.000*

^* p<0.05; (3rd to 6th order);

^† RMS Total=root mean square of total aberrations.;

^‡ RMS HoA=root mean square of total higher order aberrations

^§ SA=Spherical aberration.

Table 3.

Comparison of ocular and internal aberrations measured by OPD scan aberrometer between spherical IOL-implanted group and aspherical IOL-implanted group

Optic zone		Zernike’s coefficients	Spherical	Aspherical	P
4 mm	ocular aberration	RMS Total^†	0.802±0.553	0.792±0.390	0.937
		RMS HoA^‡	0.319±0.184	0.374±0.345	0.440
		coma 7	0.046±0.081	0.031±0.109	0.541
		coma 8	0.017±0.113	0.009±0.073	0.783
		SA^§	0.103±0.061	-0.022±0.053	0.000*
	Internal aberration	RMS Total	1.185±1.457	1.491±2.009	0.511
		RMS HoA	0.653±0.536	0.863±1.433	0.443
		coma 7	0.022±0.142	0.012±0.124	0.772
		coma 8	-0.002±0.139	-0.002±0.105	0.991
		SA	0.035±0.091	-0.110±0.163	0.000*
6 mm	ocular aberration	RMS Total	2.769±2.014	2.025±1.208	0.119
		RMS HoA	1.051±0.885	0.957±0.626	0.664
		coma 7	0.111±0.306	-0.045±0.392	0.101
		coma 8	0.044±0.299	0.019±0.130	0.709
		SA	0.416±0.235	-0.220±0.429	0.000*
	Internal aberration	RMS Total	2.412±1.564	1.851±1.079	0.140
		RMS HoA	1.438±1.076	0.925±0.619	0.039*
		coma 7	0.219±0.537	0.099±0.277	0.308
		coma 8	0.020±0.362	-0.019±0.199	0.634
		SA(internal)	0.074±0.268	-0.421±0.437	0.000*

^* p<0.05;

^† RMS Total=root mean square of total aberrations; (3rd to 6th order);

^‡ RMS HoA=root mean square of total higher order aberrations

^§ SA=spherical aberration.

Table 4.

Comparison of modulation transfer function measured by iTrace scan at 6 mm optic zone between spherical IOL-implanted group and aspherical IOL-implanted group

Spatial frequency	Spherical	Aspherical	P
5	0.156±0.105	0.276±0.158	0.005*
10	0.067±0.045	0.103±0.487	0.011*
15	0.040±0.014	0.054±0.022	0.020*
20	0.028±0.014	0.040±0.018	0.017*
25	0.022±0.010	0.030±0.013	0.017*
30	0.018±0.009	0.023±0.009	0.048*

^* p<0.05.

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