계수형 각막곡률계와 자동굴절검사기의 굴절력과 난시의 비교
Comparison of Refractive Power and Astigmatism between Digital Keratometer and Autorefractor
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목적: 백내장 수술 시 난시교정인공수정체의 난시 도수를 정확히 결정하기 위해, 각막 굴절력 및 난시 측정에 있어 VERIONⓇ Image Guided System과 자동굴절검사기 간의 측정결과를 비교하고, VERIONⓇ Digital Marker와 수동 기준표지자의 난시축 측정결과를 비교하였다. 대상과 방법: 29명 29안의 의무기록을 후향적으로 분석하여, VERIONⓇ Image Guided System과 자동굴절검사기의 각막 굴절력과 난시, 난시축의 차이를 평가하였으며, VERIONⓇ Digital Marker와 수동 기준표지자의 난시축 측정결과를 두 개의 축 간 각도의 차이를 통해 비교하였다. 결과: 평균 각막 굴절력과 난시는 자동굴절검사기보다 VERIONⓇ Image Guided System에서 높게 측정되는 경향을 보였으며, 두 군 간에 유의한 차이를 보였다. 난시축의 차이(VERIONⓇ axis – Autorefractor axis)는 평균 9.62o였다. 각막 난시가 1.0D 이상이었던 18명에서는 평균 2.82 ± 2.27o, 1.0D 미만이었던 11명에서는 평균 20.27 ± 28.14o의 차이를 보였다. 또한 VERIONⓇ Digital Marker와 수동 기준표지자의 난시축 차이는 평균 2.50o였으며, 최대 9.27o, 최소 0o였다. 결론: 평균 각막 굴절력과 난시는 VERIONⓇ Image Guided System이 자동굴절검사기보다 높게 측정되므로 생체계측 시 유의해야 할 것으로 보이며, 향후 어떤 기기가 더 정확한지에 대한 수술 결과 비교가 필요할 것으로 사료된다.
Abstract
Purpose: To compare the corneal refraction, astigmatism, and corneal marking for toric intraocular lens measured with a VERION® Image Guided System and an autorefractor in order to precisely determine the toric intraocular lens target. Methods: The medical records of 29 eyes of 29 patients were retrospectively reviewed to compare the corneal refraction, axis, and amount of astigmatism measured with a VERION® Image Guided System and an autorefractor. We compared the difference in marked axis for toric intraocular lenses as measured by a VERION Digital Marker and a manual marker. Results: The average corneal refraction and amount of astigmatism were greater with the VERION® Image Guided System than with the autorefractor. The average difference in axis of astigmatism was 9.62°. The difference in axis of astigmatism in patients with more than 1.0 D of astigmatism (18 eyes) was 2.82 ± 2.27°, while that in patients with less than 1.0 D of astigmatism (11 eyes) was 20.27 ± 28.14°. The average difference in marked axis for toric intraocular lens measured by the VERION® Digital Marker and manual marker was 2.50° (0°-9.27°). Conclusions: The corneal refraction and amount of astigmatism were significantly higher with the VERION® Image Guided System, so careful concern and comparison of surgical outcomes between the two devices is needed in biometry.
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