1 Department of Ophthalmology, Chungbuk National University College of Medicine, 776 1st Sunhwan-Ro, Gaesin-dong, Heungduk-ku, Cheongju, 361-711, South Korea.
2 Department of Ophthalmology, Chungbuk National University College of Medicine, 776 1st Sunhwan-Ro, Gaesin-dong, Heungduk-ku, Cheongju, 361-711, South Korea. phaco@mailo.cbnuh.or.kr.