This study was researched the external ocular structure on the korean young age. The results was as follows; 1. On the distance of innercanthus, the average length was 38-40 mm. In the twenties age, the male was longer then the female. 2. On the length of palpebral fissure, the average length was 35-37 mm and right and left eye was similar results. But, the male was longer than the female. 3. On the width of palpebral fissure, the average width was 7-8mm and the male and female was similar results. 4. At the near distance, the average PD was 29-33 mm, but in the twenty age, the left eye of male was longer than the right eye. On the other hand, In the female, the results was reverse. 5. At the distance, the average PD was 31-32 mm, But, In the teens, the male and female was similar results. On the other hand, In the twenties age, the male was longer than the female.