발광다이오드 각막형태분석기와 샤임플러그 전안부사진기의 각막난시 및 각막고위수차 비교
Comparison of Corneal Astigmatism and Higher-order Aberrations between Color Light-emitting Diode Topographer and Scheimpflug Imager
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목적: 발광다이오드(light emitting diode, LED) 각막형태분석기와 샤임플러그 전안부사진기 간에 각막난시, 각막곡률 및 각막고위수차를 비교하고자 하였다. 대상과 방법: 2017년 6월 7일부터 2017년 8월 2일까지 백내장수술 전 내원한 환자 45명(45안)을 대상으로 Pentacam® (Oculus, Wetzlar, Germany) 샤임플러그 전안부사진기와 Cassini® (i-Optics, Den Haag, The Netherlands) 발광다이오드(LED) 각막형태분석기를 이용하여 각막곡률, 각막난시, 난시축 및 각막고위수차를 측정하고 비교하였다. 결과: Pentacam®과 Cassini®를 사용하여 측정한 각막난시값은 두 기계 간에 차이가 없었으나 각막전면과 각막전체 난시축은 통계적으로 유의한 차이를 보였다(p<0.05). 각막전면 및 각막전체 평균각막곡률, 난시의 벡터값 J0과 J45도 두 기계 수치 간에서 통계적으로 유의한 차이를 보였다(p<0.05). 두 기기 간 난시 계측치의 일치도를 비교하였을 때 각막전체 각막난시값, 난시 벡터값 J0와 J45 모두 두 기계 간에서 낮은 일치도를 보였다. Pentacam®과 Cassini®의 각막전면 고위수차를 비교하였을 때 구면수차, 수직 및 수평코마수차, 세조각수차와 네조각수차값 모두 두 기기 간에 유의한 차이가 없었다. 결론: 다른 원리를 사용하는 두 기기에서 측정한 각막전면 및 각막전체 난시축은 통계적으로 유의한 차이를 보였다. 두 기기 간 각막난시값은 차이가 없었으나 측정치에서는 낮은 일치도를 보였다.
Abstract
Purpose: To compare corneal astigmatism, keratometry and corneal higher order aberrations between the light emitting diode corneal topography analyzer and Scheimpflug Imager. Methods: This prospective study involved 45 patients (45 eyes) who visited Seoul St. Mary’s hospital before cataract surgery from June 7, 2017, to August 2, 2017. For each eye, keratometry, astigmatism and its axis of cornea, higher-order aberrations were evaluated with a Scheimpflug Imager (Pentacam HR®, Oculus, Wetzlar, Germany) and a color-LED corneal topographer (Cassini®, i-Optics, Den Haag, The Netherlands). Results: Astigmatism magnitude measured using Cassini® and Pentacam® showed no statistically differences but anterior and total astigmatic axes were significantly different, as measured by the two devices (p < 0.05). Anterior and total mean keratometry were statistically significantly different, as measured by the two devices (p < 0.05). J0 and J45 vectors of anterior and total cornea were statistically different (p < 0.05). In addition, Cassini® and Pentacam® showed discrepancies between total corneal astigmatism, total J0 and J45 vectors. Corneal anterior spherical aberration, vertical and horizontal coma, and oblique and horizontal trefoil aberrations were not statistically different between the two devices. Conclusions: Astigmatic axes obtained from the two devices based on different principles showed statistically significant differences. Astigmatism magnitude was not statistically different but showed a discrepancy between the two devices.
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