Abstract Purpose : The purpose of this study is to evaluate the differences and reliability of various methods for measuring Interpupillary Distance. Methods : The participants were 50 Cambodian adults (28.08±3.85 years old) without ocular disease and abnormal binocular vision. Far/near IPD was measured using Corneal reflection pupillometer, PD ruller and spotting, and calculated formula for fixation distance. Using each method, the pupil distance of both eyes was measured three times, respectively, and the average value was recorded. Results : The average value of the corneal reflection pupilometer in the distance was 63.08±3.42 mm, the average value of PD calculated formula was 62.97±3.41 mm, the average value of the PD ruler was 63.72±3.17 mm, and the average value of the spotting method was 63.89±3.15 mm. The average value of the corneal reflection pupilometer in the near was 59.85±3.23 mm, the average value of the calculated formula for fixation distance was 59.95±3.23 mm, the average value of PD ruler was 59.72±3.29 mm, and the average value spotting method was 59.47±3.23 mm. Comparison between various methods in the distance and near showed statistically significant differences (p<0.001). Conclusion : In the comparative analysis between each method, the corneal reflection pupillometer is considered to be the most accurate method, but since there is no significant difference from the average value of the Spotting method, the PD Ruler Viktorin method, and the calculated formula for fixation distance, whichever method is used, it is clinically acceptable. Therefore it is believed that each method is compatible with each other. Key words : Corneal reflection pupillometer, PD meter, PD ruler, Spotting

단안 PD 측정값에 영향올 줄 수 있는 사시안올 제외한 건강한 20 대 여성 32 명(1 9 -29 세)과 40대 이후 여성 71 명 (40-73세)올 대상으로 안경자와 각막반사식 동공거리 계로 왼용 PD와 주시거리 40cm 및 33cm에 대한 근용 PD훌 측정하였으며， 근용 PD 측정값은 왼용 PD 측정값으로부터 계산된 근용 PD값과 비교하였다. 20 대 여성 군에서 안경자로 측정한 원용 PD값이 각막반사식 동공거리계로 측정한 값보다 더 높았다. 20 대 여성군과 40대 이후 여성군에서 각막반사식 동공거리계로 측정한 원용 PD 값과 주시거리 40cm에 대한 근용 PD값은 40 대 이후 여성군에서 더 높게 나타 났으며， 주시거리 33cm에 대한 근용 PD 값은 20 대 여성군이 더 높게 나타났으나， 유의성이 없었으며， 20 대 여성군과 40 대 이후 여성군에서 각막반사식 동공거리계로 측정한 원용 PD와 주시거리 40cm 및 33cm에 대한 근용 PD 값 모두 우안이 좌안 보다 더 크게 측정되었고 유의한 차이를 보였다. 또한 원용 PD와 근용 PD 의 차이는 20 대 여성군에서 2.52mm( 주시거리 40cm) 와 3.13mm( 주시거리 4O cm} 였으며， 40 대 이후 여성군에서 3.23mm( 주시거리 40cm) 와 4.03mm( 주시거리 4O cm} 였다.