근시교정 각막굴절수술 선별검사를 위한 각막전면중심점과 각막전면최적구면 사이의 최소거리의 의의

• 영문명: Screening of the Previous Photorefractive Surgery Using the Minimum Distance Between the Anterior Best Fit Sphere and the Center of the Anterior Corneal Surface
• 발행기관: 대한안과학회
• 저자명: 김이후 이재환 오중협,Lee Hoo Kim, M.D., Jae Hwan Lee, M.D., Jung Hyub Oh, M.D., Ph.D.
• 간행물 정보: 『대한안과학회지』Ophthalmological Society,volume49,number1, 27~33쪽, 전체 7쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 2008.01.31

영문 초록

`Purpose: To develop a screening test based on the difference (Diff) between the anterior corneal surface and the anterior best?fit sphere in the central region of the Orbscan IIz topography as a way of detecting previous myopic photorefractive surgery. Methods: From 1623 patients who had no refractive surgery and no corneal disease, 3132 topographies were defined as normal. From 120 patients who had Orbscan IIz topography after myopic photorefractive surgery, 238 topographies were defined as eyes that had undergone refractive surgery. The first objective was to determine the difference (Diff) between the anterior corneal surface and the anterior best?fit sphere in the central region. The second objective was to classify the anterior elevation map of Orbscan IIz topography. Results: The Diff value of the center of the anterior cornea surface averaged 0.008±0.003 mm in normal eyes, and all values were over 0 mm. However, in eyes that had previous refractive surgery, the average was 0.014±0.009 mm, and all values in this group were less than 0. The specificity and sensitivity was 100 % in both groups. The spherical equivalent of the degree of myopic correction and the Diff value of the center of the anterior cornea surface showed a linear relationship. Consequently, we could derive a formula to determine the degree of myopic correction with a known Diff value of the center of the anterior corneal surface. Conclusions: The screening test, based on the Diff value of Orbscan IIz topography, is quite useful in determining whether an eye has undergone previous myopic photorefractive surgery.`

키워드

Difference, Orbscan, Photorefractive, Screening