안축장에 따른 안축장, 전방깊이, 각막곡률, 각막난시 차이
Interocular Difference of Axial Length, Anterior Chamber Depth, Keratometry, Corneal Astigmatism According to Axial Length
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목적: 안과 수술력이 없는 안에서 안축장에 따른 안축장, 전방깊이, 각막곡률, 각막난시 차이를 확인하고자 하였다. 대상과 방법: 2007년 4월부터 2016년 9월까지 IOL Master® 검사를 시행한 환자 중 결측치가 있거나 안축장 극단치에 포함되는 대상을 제외한 16,411명(32,825안)을 연구에 포함하였다. 안축장(axial length)을 4군(24 mm 미만, 24 mm 이상 26 mm 미만, 26 mm 이상 28 mm 미만, 28 mm 이상)으로 구분한 후, 안축장에 따른 여러 변수들의 차이를 알아보았다. 나이와 성별을 보정하기 위해서 나이와 성별에 대해 1:1:1:1 무작위 매칭을 시행하였다. 결과: 양안의 평균 안축장이 길수록 양안 사이의 안축장 차이, 전방깊이 차이, 평균 각막곡률 차이가 커졌다. 단안의 안축장이 길어질수록 평균 각막곡률은 작아졌지만, 전방깊이, 각막난시는 증가하였다. 안축장이 긴 군일수록 전방깊이는 깊었고, 각막곡률은 작았고, 각막난시는 컸으며, 높은 연령대일수록 전방깊이는 얕고, 각막곡률은 크고, 각막난시는 작았다. 결론: 양안의 평균 안축장이 길수록 양안의 안축장, 전방깊이, 평균 각막곡률 등 생체계측치의 차이가 크므로, 안축장이 긴 환자, 특히 축성 근시 환자를 진료하거나 연구함에 있어 대조군으로 반대안을 설정하는 데 있어서 주의가 필요하다.
Abstract
Purpose: To investigate the interocular difference of axial length (AL), mean keratometry (K), corneal astigmatism and anterior chamber depth (ACD) according to AL without history of ocular surgery. Methods: This study was performed on 16,411 patients (32,825 eyes) who were measured AL, K, corneal astigmatism and ACD by IOL Master® from April 2007 to September 2016, excluding patients with missing values and extreme values in AL. After, patients were divided into four groups based on AL; AL < 24 mm, 24 mm ≤ AL < 26 mm, 26 mm ≤ AL < 28 mm, AL ≥ 28 mm, we investigated which variables were associated according to AL. To compensate for age and sex, 1:1:1:1 random matching was performed for age and sex. Results: The longer the average AL of both eyes, the greater the difference between the AL, ACD and mean corneal K of both eyes. The longer AL group had the deeper ACD, the flatter mean corneal K, the higher corneal astigmatism. The older age group had the more shallow ACD, the steeper mean corneal K, lower corneal astigmatism. Conclusions: Ophthalmologists have to be careful in setting fellow eye as control in treating or studying patients with long AL or axial myopia. Because, the longer the average AL of both eyes, the greater the difference between the AL, the ACD and the mean corneal K of both eyes.
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