목 적: 조도 변화에 의한 조절력과 양성융합버전스의 변화를 알아보고자 하였다. 방 법: 전신질환이나 안질환이 없는 남녀 24.51(±2.82)세 49명을 대상으로 실시하였다. 조도 환경은 조 도계((LX-101, Lutron, USA)와 조광기를 이용하여 10 lux에서 1000 lux까지 조도를 변경시켜가면서 조절 력과 원·근거리 양성융합버전스를 측정하였다. 결 과: 조절력은 10 lux 조도에서 8.51 D로 가장 낮았으며, 800 lux에서 9.12 D로 가장 높았고, 조도가 증가될수록 조절력도 증가하다가 유지되는 지수함수식(y=9.09-0.62e- )이 나타났다. 원거리 양성융합 버전스의 분리점은 10 lux에서 20.81 △으로 가장 높게 나타났으며, 조도가 증가되면서 점차 감소하다가 변 화가 적어지는 지수함수식(y=17.08+4.66e- )이 나타났다. 근거리 양성융합버전스의 분리점도 낮은 조 도인 10 lux에서 21.42 △으로 가장 높았으나 조도가 증가하면서 감소하다가 변화가 적어지는 지수함수식 (y=20.93+0.63e- )이 나타났다. 결 론: 조도가 증가함에 따라 조절력은 증가하고, 원거리 및 근거리 양성융합버전스는 낮은 조도에서는 증가하며, 점차 조도가 증가되면서 감소하다가 변화가 적어지는 양상을 보인다.

The aims of the current study were to assess reliability of range of motion (ROM) measurement of glenohumeral internal rotation (GIR) with a pressure biofeedback stabilization (PBS) method and to compare the reliability between manual stabilization (MS) and the PBS method. In measurement of pure glenohumeral joint motion, scapular stabilization is necessary. The MS method in GIR ROM measurement was used to restrict scapular motion by pressing the palm of the tester’s hand over the subject’s clavicle, coracoid process, and humeral head. The PBS method was devised to maintain consistent pressure for scapular stabilization during GIR ROM measurement by using a pressure biofeedback unit. GIR ROM was measured by 2 different stabilization methods in 32 subjects with GIR deficit using a smartphone clinometer application. Repeated measurements were performed in two test sessions by two testers to confirm inter- and intra-rater reliability. After tester A performed measurements in test session 1, tester B’s measurements were conducted one hour later on the same day to assess the inter-rater reliability and then tester A performed again measurements in test session 2 for confirming the intra-rater reliability. Intra-class correlation coefficient (ICC) (2,1) was applied to assess the inter-rater reliability and ICC (3,1) was applied to determine the intra-rater reliability of the two methods. In the PBS method, the intra-rater reliability was excellent (ICC=.91) and the inter-rater reliability was good (ICC=.84). The inter-rater and intra-rater reliability of the PBS method was higher than in the MS method. The PBS method could regulate manual scapular stabilization pressure in inter- and intra-rater measuring GIR ROM. Results of the current study recommend that the PBS method can provide reliable measurement data on GIR ROM.

Purpose: To examine the relationship between working in a very dry clean room (relative humidity less than 1%) and dry eye, and its progress by lapse of time. Methods: Targeting 352 employees working in a clean room of onesecondary cell production plant, it performed a dry eye examination in 2011, 2012, and 2013, totally three times. It performed the TFBUT, Schirmer’s test,slit lamp microscope examination, and Mac Morning survey. dry eye stages were classified based on the DEWS criteria. The annual examination results were analyzed through the Anova test and the post-mortem was conducted with Tukey, and in order to learn the effect of working time on dry eye, anunivariate logistic regression analysis was conducted having dry eye examination results as a dependent variable and working time as an independent variable. Results: According to TFBUT and Mac Morning survey, dry eye degenerated as time passed. There was no change in the Schirmer’s test. Considering that as a result of the univariate logistic regression analysis having dry eye examination results as a dependent variable and working time as an independent variable, in the Mac Morning survey, the cross ratio increased up to 1.127(95%CI 1.033~1.230)by lapse of time, it could be found that as working time is elongated, the complaining rate of dry eye increases. Conclusion: It is thought that a clean room with a relative humidity less than 1% affects causing dry eye. Working time limitation, job rotation, and health care such as prescription of artificial tear solution without preserved agent are necessary.