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

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

• Son SW
• Seo JW
• Shin SJ
• Chung SK

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.

Keyword

Anterior chamber depth; Aspheric IOL; Decentration; Refraction; Tilt

MeSH Terms

Anterior Chamber
Anterior Eye Segment
Cataract
Eye
Lenses, Intraocular

Figure

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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.

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  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.

Reference

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