Comparison of the Stability Between Three-piece and Single-piece Aspheric Intraocular Lenses

Sung Wan Son; Jung Won Seo; Seong Joo Shin; Sung Kun Chung

doi:10.3341/jkos.2010.51.12.1584

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Son, Seo, Shin, and Chung: Comparison of the Stability Between Three-piece and Single-piece Aspheric Intraocular Lenses

Original Article

J Korean Ophthalmol Soc 2010;51(12):1584-1589.

Published online: 7 September 2010

DOI: https://doi.org/10.3341/jkos.2010.51.12.1584

Comparison of the Stability Between Three-piece and Single-piece Aspheric Intraocular Lenses

Sung Wan Son, MD¹, Jung Won Seo, MD¹, Seong Joo Shin, MD¹, Sung Kun Chung, MD, PhD²

¹Department of Ophthalmology, SahmYook Seoul Hospital, Seoul, Korea

²Department of Ophthalmology, St, Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea

Address reprint requests to Sung Kun Chung, MD, PhD Department of Ophthalmology, St. Mary's Hospital, The Catholic University of Korea School of Medicine #62 Yeouido-dong, Yeongdeungpo-gu, Seoul 150-713, Korea Tel: 82-2-3779-1150, Fax: 82-2-761-6869, E-mail: eyedoc@catholic.ac.kr

Received 4 June 2010 Accepted 10 November 2010

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

The goal of the present study was to compare the stability of the 3-piece (Tecnis^® ZA9003) and single-piece (AcrySof^® IQ) aspheric intraocular lenses (IOL) by testing decentration, tilt, anterior chamber depth, and refraction.

Methods

The subjects of this study consisted of 101 eyes who had undergone cataract surgeries with a 3-piece aspheric IOL (54 eyes) and with a single-piece aspheric IOL (47 eyes). The decentration, tilt, anterior chamber depth, and refraction were measured on postoperative day 1, 1 month, and 2 months, using an anterior eye segment analysis system (EAS-1000, Nidek, Japan).

Results

There was a statistically significant difference in the decentration on the postoperative day 1 (p = 0.04). However, there was no statistically significant difference on postoperative 1 month (p = 0.15) and 2 months (p = 0.13). There was no statistically significant difference in the tilt on postoperative day 1, 1 month, and 2 months. There was no statistically significant difference in the anterior chamber depth on postoperative day 1, 1 month, and 2 months. There was a statistically significant difference in the refraction on postoperative day 1 (p = 0.03). However, there was no statistically significant difference on postoperative 1 month (p = 0.07) and 2 months (p = 0.07).

Conclusions

There was no statistically significant difference in the decentration, anterior chamber depth, and refraction between the 3-piece and single-piece aspheric IOL. Therefore, there is no difference between the 3-piece and single-piece aspheric IOL in the capsular bag stability until 2 months postoperatively.

Keywords: Anterior chamber depth, Aspheric IOL, Decentration, Refraction, Tilt

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Figure 1.

The decentration, tilt, anterior chamber depth of IOL are measured at 90° (top), 180° (bottom) direction using the Scheimpflug camera. Vertical green line denotes visual axis, and yellow line denotes the axis of intraocular lens. Decentration of intraocular lens is measured by calculating the distance between the vertex point of the intraocular lens and the visual axis. Anterior chamber depth is calculated by measuring the average distance between the corneal surface to the anterior surface of the intraocular lens at 90° and 180° angle from the Scheimpflug image.

Figure 2.

The tilt is measured by connecting the three points of the corneal surface and the anterior and posterior surface of the intraocular lens and measuring the angle between the axis of intraocular lens and visual axis and used the automatic image analysis program for calculation.

Table 1.

Characteristics of the three-piece and single-piece aspheric intraocular lens

	Tecnis ZA9003	AcrySof IQ
Lens	Three-piece	Single-piece
Optic material	Hydrophobic acrylic	Hydrophobic acrylic
Refractive index	1.47	1.55
Spherical aberration (µ m)	−0.27	−0.20
Optic size (mm)	6	6
Overall length (mm)	13	13
Design	Prolate anterior surface	Prolate posterior surface
Haptic angulation (°)	5	0
Haptic material	PMMA	Hydrophobic acrylic

Table 2.

Postoperative changes in the decentration length, tilt, anterior chamber depth

	IOL groups	Postoperative day
	IOL groups	1 day	1 mon	2 months
Decentration (mm)	Tecnis ZA9003	0.071 ± 0.051	0.096 ± 0.063	0.062 ± 0.039
	AcrySof IQ	0.112 ± 0.087	0.176 ± 0.414	0.052 ± 0.062
	p value^*	0.04	0.15	0.13
Tilt (°)	Tecnis ZA9003	2.47 ± 0.94	2.01 ± 0.81	1.71 ± 0.78
	AcrySof IQ	2.69 ± 0.84	2.35 ± 1.01	2.18 ± 0.85
	p value^*	0.14	0.16	0.14
Anterior chamber depth (mm)	Tecnis ZA9003	0.354 ± 0.041	0.353 ± 0.031	0.352 ± 0.029
	AcrySof IQ	0.272 ± 0.058	0.198 ± 0.051	0.184 ± 0.041
	p value^*	0.05	0.07	0.08

^* Independent samples t-test.

Table 3.

Postoperative changes in the mean spherical equivalent (D)

IOL groups	Postoperative day
IOL groups	1 day	1 mon	2 months
Tecnis ZA9003	0.36 ± 0.62	0.58 ± 0.57	0.64 ± 0.42
AcrySof IQ	0.52 ± 0.84	0.72 ± 0.68	0.79 ± 0.64
p value^*	0.03	0.07	0.07

^* Independent samples t-test.

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