Cheolmin Yun1, Jaeryung Oh2. 1. Department of Ophthalmology, Korea University College of Medicine, 126-1 Anam-dong 5-ga, Sungbuk-gu, Seoul, 136-705, Korea. 2. Department of Ophthalmology, Korea University College of Medicine, 126-1 Anam-dong 5-ga, Sungbuk-gu, Seoul, 136-705, Korea. ojr4991@yahoo.co.kr.