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목적 : To evaluate the accuracy of corneal astigmatism values using Scheimpflug imaging by comparing the actual preoperative corneal astigmatism derived from postoperative residual astigmatism for toric intraocular lens (IOL) implantation.
방법 : Phacoemulsification with toric Precizon IOL implantation was performed in 41 eyes with corneal astigmatism (range: 1~5 diopters(D)). Corneal astigmatisms were obtained from an IOLMaster reading and Pentacam readings (SimK, wavefront, true net power, total corneal refractive power, and Vector (derived by manual vector summation using corneal front and back power)). The prediction error and intraclass correlation were calculated as the difference and coefficient, respectively, between the measured astigmatism and the actual corneal astigmatism estimated by IOL toricity and residual astigmatism.
결과 : With the IOLMaster, SimK, wavefront, true net power, total corneal refractive power and Vector, the centroid mean corneal astigmatism prediction errors were, respectively, 0.59@103, 0.61@103, 0.42@106, 0.04@8, 0.07@82, and 0.19@130 in with-the-rule (WTR) astigmatism eyes, and 0.22@87, 0.16@74, 0.51@25, 0.31@58, 0.29@50 and 0.14@36 in against-the-rule (ATR) astigmatism eyes at postoperative 3-month. Among the 6 modalities, the Vector showed the lowest WTR astigmatism prediction error and the highest intraclass correlation coefficient for the actual corneal astigmatism in both WTR and ATR eyes.
결론 : The vector summation using anterior and posterior corneal surface measured from Pentacam could be a promising tool for determination of toric IOL cylinder power.
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