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Lee, Lee, and Chung: Decentration, Tilt and Anterior Chamber Depth: Aspheric vs Spheric Acrylic Intraocular Lens
Original Article

J Korean Ophthalmol Soc 2009;50(6):852-857.

Published online: 7 September 2009

DOI: https://doi.org/10.3341/jkos.2009.50.6.852

Decentration, Tilt and Anterior Chamber Depth: Aspheric vs Spheric Acrylic Intraocular Lens

Ja Young Lee, MD1, Seung Hee Lee, MD1, Sung Kun Chung, MD2

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

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

Address reprint requests to Sung Kun Chung, MD, PhD Department of Ophthalmology, St. Mary's Hospital, College of Medicine, The Catholic University of Korea #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 14 July 2008       Accepted 10 March 2009

Copyright © 2009 Korean Ophthalmological Society

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 the decentration, tilt and anterior chamber depth between aspheric AcrySof® IQ IOL (SN60WF) and spheric AcrySof® Natural IOL (SN60AT).

Methods

The subjects of this study consisted of 22 patients (26 eyes) using an aspheric AcrySof® IQ IOL and 26 patients (31 eyes) using spheric AcrySof® Natural IOL. All lenses were inserted into the capsular bag after 5 mm continuous curvilinear capsulorhexis and phacoemulsification. The decentration, tilt and anterior chamber depth of both IOLs were measured on the 1 st, 30 th and 60 th postoperative day using an anterior eye segment analysis system (Scheimpflug camera, EAS-1000, Nidek, Japan).

Results

There was no statistically significant difference in the decentration between the IQ IOL and Natural IOL on the 1 st (p=0.05), 30 th (p=0.09) and 60 th (p=0.06) postoperative day. There was a statistically significant difference in tilt between IQ IOL and Natural IOL on the 1 st (p=0.000053) and 30 th (p=0.018) postoperative day. However, there was no statistically significant difference in tilt on the 60 th postoperative day (p=0.05). The anterior chamber depth of IQ IOL was decreased, but was not statistically significant on the 1 st (p=0.10), 30 th (p=0.07) or 60 th (p=0.06) postoperative day.

Conclusions

There were no significant differences between AcrySof® IQ IOL and AcrySof® Natural IOL in decentration, tilt or anterior chamber depth, showing that posterior aspheric surface causes little effect on the IOL stability.

Keywords: AcrySof®, IQ IOL, AcrySof®, natural IOL, Anterior chamber depth, Decentration, Tilt

References

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Figure 1.
The decentration, tilt and anterior chamber depth of IOL were measured at 90 o, 180 o direction using CCD camera of Scheimpflug camera. (A) 90° direction: anterior chamber depth was measured. (B) 180° direction: Vertical white line denotes visual axis yellow line, the axis of intraocular lens. Tilt was measured as tilting angle of intraocular lens from the measurement of visual axis. Decentering was measured as distance from the measurement visual axis to the vertex point of the intraocular lens.
jkos-50-852f1.tif
Table 1.
Patient characteristics
AcrySof® IQ IOL AcrySof® Natural IOL
Number of eyes 26 31
Sex (M/F) 12/14 9/22
Age (years) 66.62±10.77 65.54±10.87
Age distribution (years)(minimum-maximum) 38–83 41–86
Table 2.
Character ristics of two i intraocular lenses
AcrySof® IQ IOL (SN60WF) AcrySof® ® Natural IOL (SN60AT)
Type 1 piece
Overall length (mm) 13.0
Diameter (mm) 6.0
Optic Material Hy Biconvex, ydrophobic acrylic Biconvex
Shape Aspherical posterior surface e
Haptic angulation 0
A-constant 118.7 118.4
Recfractive index 1.55
Table 3.
Postoperative changes in the length of the intraocular lens decentration (mm)
Postoperative day
1 day 30 days 60 days
AcrySof® IQ IOL 0.107±0.085 0.248±0.969 0.0673±0.071
AcrySof® Natural IOL 0.248±0.354 0.192±0.128 0.203±0.229
p-value* 0.05 0.09 0.06

* Independent samples t-test.

Table 4.
Postoperative changes in the degree of the intraocular lens tilt (°)
Postoperative day
1 day 30 days 60 days
AcrySof® IQ IOL 2.66±0.87 2.29±1.09 2.20±0.85
AcrySof® Natural IOL 1.78±0.82 1.67±0.83 1.70±0.99
p-value* 0.000053 0.018 0.05

* Independent samples t-test.

Table 5.
Postoperative changes in the degree of the anterior chamber depth (mm)
Postoperative day
1 day 30 days 60 days
AcrySof® IQ IOL 0.278±0.054 0.193±0.038 0.188±0.040
AcrySof® Natural IOL 0.386±0.071 0.266±0.055 0.308±0.061
p-value* 0.10 0.07 0.06

* Independent samples t-test.

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