DIGITAL SYSTEM MEASUREMENT OF DECENTRATION OF WORST-FECHNER IRIS CLAWMYOPIA INTRAOCULAR-LENS

BACKGROUND: Topography measures the centration in refractive and corne al refractive surgery, but until recently there was no effective metho d to measure decentration in intraocular lens (IOL) implantation. PATI ENTS AND METHODS: We measured the decentration of 22 phakic eyes, in 1 4 high myopic patients, based upon photographs of the anterior segment using a digital analysis system ((IMAGEnet Topcon Corporation 1988, T okyo, Japan). These eyes had undergone IOL implantation for the correc tion of myopia with Worst-Fechner iris claw lenses. Decentration was m easured with respect to the centers of both the cornea and pupil. RESU LTS: Mean decentration of the IOL center from the cornea center was 0. 51 +/- 0.25 mm (range, 0 to 0.8374 mm). When measured with respect to the center of the pupil, the average decentration was 0.47 +/- 0.29 mm (range, 0.182 to 0.9341 mm). A positive correlation between the decen tration measurements of the two methods was found (p < .01 indicated s tatistical significance). CONCLUSIONS: This digital imaging system (IM AGEnet) accurately measured decentration of IOLs in myopic eyes.