Abstract
목적: 크로스실린더를 이용한 난시정밀검사에서 망막 상의 최소착란원 위치가 난시교정값에 미치는 영향을 알아보고자 하였다. 방법: 평균나이 <TEX>$22.24{\pm}2.48$</TEX>세의 62명(115안)을 대상으로 검사하였다. 방사선시표를 이용한 난시검사 후 최대교정시력이 얻어진 구면굴절력(MPMVA) 상태에서 크로스실린더를 이용한 정밀검사를 실시하였다. 그런 다음 S+0.75 D, S+0.50 D, S+0.25 D, S-0.25 D, S-0.50 D, 그리고 S-0.75 D의 렌즈를 각각 더한 상태(최소착락원의 위치이동)에서 동일한 정밀검사를 실시하고, 얻어진 검사값을 MPMVA 상태에서 얻어진 검사값과 비교하였다. 결과: MPMVA 상태의 검사값과 비교하여 더해준 (+)구면렌즈와 (-)구면렌즈가 증가할수록 축 변화량은 증가하였다. 동일한 검사상태에서 난시굴절력이 높을수록 축 변화량은 감소하였다(p<0.05). MPMVA 상태의 검사값과 비교하여 더해준 (+)구면렌즈가 증가할수록 난시굴절력은 낮게 나타났고(p<0.05), (-)구면렌즈가 증가할수록 높게 나타났다. (+)구면렌즈를 더해준 경우, 동일한 검사상태에서 난시굴절력이 높을수록 검사값의 차이는 더 크게 나타났다. 결론: 올바른 난시교정값을 얻기 위해서 크로스실린더를 이용한 난시정밀검사 전 최소착락원 위치를 정확히 조정하여야 한다. Purpose: To investigate the changes of corrective values of astigmatism caused by the position of circle of least confusion on retina in refining astigmatic test using cross cylinder. Methods: 62 subjects (115 eyes) aged <TEX>$22.24{\pm}2.48$</TEX> years participated for this study. After astigmatic test using a radial chart, refining test was performed using a cross cylinder in a condition of maximum plus to maximum visual acuity (MPMVA). Astigmatic refining test was repeatedly performed in each condition of which S+0.75 D, S+0.50 D, S+0.25 D, S-0.25 D, S-0.50 D, and S-0.75 D are added to spherical lenses of MPMVA. The measured values were compared with the values in MPMVA condition. Results: As compared with values in condition of MPMVA, change of astigmatic axis was increased with add the power of (+) spherical lenses and (-) spherical lenses. In same spherical condition, change of astigmatic axis was decreased with increment of astigmatic power (p<0.05). The corrective power of astigmatism was reduced with increment of (+) spherical lenses (p<0.05), and was raised with increment of (-) spherical lenses compared with the power in MPMVA condition. In case of adding (+) spherical lenses, difference of astigmatic power increased with increment of corrective astigmatism power in same test condition. Conclusions: In order to obtain a proper values for corrective astigmatism, position of circle of least confusion should be accurately adjusted before the performing an astigmatism's refining test.
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