목적: 자동굴절검사로 측정한 굴절이상도를 자각적 굴절검사와 비교분석하였다. 방법: 성인 100명(200안, 평균연령 22.04±3.14세)을 대상으로 사진굴절검사기(VS100), 개방형 자동굴절계(Nvision k-5001), 폐쇄형 자동굴절계(ARK-1a)를 이용하여 굴절이상도를 측정하였고, power vector 성분(M, J0, J45)으로 변환하여 자각적 굴절검사와 비교하였다. 결과: 자각적 굴절검사와 VS100의 평균값 차이는 M = -0.08±0.67 D, J0 = -0.02±0.28 D, J45 = 0.01±0.23 D로 측정되었고, 모든 성분에서 유의한 차이는 없었다(p>0.05). 정확도계수는 M = 1.313, J0 = 0.564, J45= 0.454로 나타났다. 자각적 굴절검사와 ARK-1a의 평균값 차이는 M = 0.49±0.84 D, J0 = −0.05±0.19 D, J45 = 0.01±0.14 D로 측정되었고, M 성분과 J0 성분은 유의한 차이가 있었으며(p<0.05), J45 성분은 유의한 차이가 없었다(p>0.05). 정확도 계수는 M = 1.664, J0 = 0.372, J45 = 0.292로 나타났다. 자각적 굴절검사와 Nvision K-5001의 평균값 차이는 M = 0.16±0.63 D, J0 = -0.09±0.30 D, J45 = 0.01±0.18 D로 측정되었고, M 성분과 J0 성분은 유의한 차이가 있었으며 (p<0.05), J45 성분은 유의한 차이가 없었다(p>0.05). 정확도계수는 M = 1.250, J0 = 0.603, J45= 0.364로 나타났다. 결론: 자동굴절검사기의 굴절이상도를 비교분석한 결과 사진굴절검사기의 굴절력이 플러스 방향으로 측정되었으나 이는 조절의 영향을 덜 받기 때문이라고 생각되며, 그 차이값이 임상적인 관점에서 작다고 판단된다. VS100의 민감도는 87.7%, 특이도는 75.9%로 굴절이상도 측정에 유용하며 자각적 굴절검사와 높은 상관관계를 나타내었다. 사진굴절검사기는 양안이 개방되어 자연시 상태로 짧은 시간에 큰 오차 없이 굴절이상을 측정할 수 있어 자각적 굴절검사의 예비검사로 사용가능한 검사기구가 될 수 있을 것으로 생각된다.
Purpose: This study was conducted for comparition the refractive error measured by auto-refraction and subjective refraction. Methods: 100 adults (200 eyes, mean age 22.04±3.14 years) included in this study. Refractive error was measured using by a Photorefractor (VS100), an open-view autorefractor (Nvision k-5001), and a closed autorefractor (ARK-1a). The measured values were converted into power vector components (M, J0, J45) and compared with subjective refraction. Results: The mean difference between subjective refraction and VS100 was M = -0.08±0.67 D, J0= -0.02±0.28 D, J45 = 0.01±0.23 D, and there was no significant difference in all components (p>0.05). The accuracy coefficients were M= 1.313, J0= 0.564, J45= 0.454. The mean difference between the subjective refraction and ARK-1a was M = 0.49±0.84 D, J0 = -0.05±0.19 D, J45 = 0.01±0.14 D, and there was a significant difference between the M and J0 components (p<0.05). However J45 components were not significantly different (p>0.05). The accuracy coefficients were M = 1.664, J0 = 0.372, J45 = 0.292. The mean difference between the subjective refraction and the Nvision K-5001 was M = 0.16±0.63 D, J0 = -0.09±0.30 D, J45 = 0.01±0.18 D, with a significant difference between M and J0 components (p<0.05), but there was no significant difference in J45 (p>0.05). The accuracy coefficients were M = 1.250, J0 = 0.603, J45 = 0.364. Conclusions: As a result of comparing the refractive error of the autorefractor, the refractive power of the photorefractor was measured in the positive direction, but this is considered to be less influenced by the accommodation, and the difference is considered to be small in term of clinical view. The sensitivity of VS100 was 87.7% and the specificity was 75.9%, which was useful for measuring refractive error and correlated with subjective refraction. Photorefractor can be used as a preliminary examinations for subjective refraction because they can open the binocular and measure the refraction error without a large mistake in a short time.