군날개 수술 전후의 각막형태검사기와 파면수차계를 이용한 난시벡터분석 및 고위수차의 변화

다국어 초록 (Multilingual Abstract)

Purpose: To determine the power vector and aberrations before and after surgery for pterygium using a corneal topographer and a wavefront aberrometer. Methods: The study group consisted of 34 eyes of 31 patients with pterygium, and were divided into two groups by pterygium size (< 3 mm, group I ≥ 3 mm, group II). Power vector and wavefront aberrations were evaluated using a corneal topographer (Oculus inc., Germany) and a wavefront aberrometer (LADARWAVEⓇ, Hartmann shack aberrometer, Alcon inc., US) at pre- and postoperative 1 week, 1 month, and 3 months. Results: The preoperative blurring strength (B) and high order aberrations significantly decreased at postoperative 3 months in all groups (P<0.05). Power vector scattergraphs showed the cluster of points gathered around the zero point in group I, but not in group II at postoperative month three. The change rates of high order aberrations were significantly greater in group I than in group II in the preoperative period compared to the postoperative first week period. Conclusions: Improvements of the power vector and high order aberrations were more remarkable in group I (< 3 mm) than in group II (≥ 3 mm). To reduce aberrations and astigmatism effectively, we suggested surgical intervention in eyes with pterygia sized < 3.0 mm. J Korean Ophthalmol Soc 2008;49(11):1737-1745

참고문헌 (Reference)

1 오재룡, "라식 수술 후 안구 수차의 변화" 대한안과학회 44 (44): 278-283, 2003

2 Smolek MK, "Zernike polynomial fitting fails to represent all visually significant corneal aberrations" 44 : 4676-4681, 2003

3 Yagmur M, "Visual acuity and corneal topographic changes related with pterygium surgery" 21 : 166-170, 2005

4 Walland MJ, "The effect of recurrent pterygium on corneal topography" 13 : 463-464, 1994

5 Kampitak K, "The effect of pterygium on corneal astigmatism" 86 : 16-23, 2003

6 Roberts C, "The cornea is not a piece of plastic" 16 : 407-413, 2000

7 Reinstrow SD, "The conjunctiva, in : Textbook of Ophthalmology" Mosby- Wolfe 1995

8 Maheshwari S, "Pterygium-induced corneal refractive changes" 55 : 383-386, 2007

9 Lindsay RG, "Pterygium-induced corneal astigma tism" 84 : 200-203, 2001

10 Avisar R, "Pterygium- induced corneal astigmatism" 2 : 14-15, 2000

11 Avisar R, "Pterygium- induced corneal astigmatism" 2 : 14-15, 2000

12 Thibos LN, "Power vector analysis of the optical outcome of refractive surgery" 27 : 80-85, 2001

13 Tomidokoro A, "Effects of pterygium on corneal spherical power and astigmatism" 107 : 1568-1571, 2000

14 Bahar I, "Effect of pterygium surgery on corneal topography: a prospective study" 23 : 113-117, 2004

15 Soriano JM, "Effect of pterygium operation on preoperative astigmatism: prospective study" 90 : 688-690, 1993

16 Stern GA, "Effect of pterygium excision on induced corneal topographic abnormalities" 17 : 23-27, 1998

17 Ozdemir M, "Early and late effects of pterygium surgery on corneal topography" 36 : 451-456, 2005

18 Lin A, "Correlation between pterygium size and induced corneal astigmatism" 17 : 28-30, 1998

19 Budak K, "Corneal topographic changes induced by excision of perilimbal lesions" 30 : 458-464, 1999

20 Pesudovs K, "Corneal first surface wavefront aberrations before and after pterygium surgery" 22 : 921-925, 2006

21 Oldenburg JB, "Conjunctival pterygia: mechanism of corneal topographic changes" 9 : 200-204, 1990

22 Hong JW, "Comparison of refractive change measured by corneal topography between before and after pterygium excision" 37 : 1614-1619, 1996

23 Kang SW, "Changes in the corneal curvature and recurrence rate following pterygium surgery with relation to pterygium size and morphology" 42 : 1255-1264, 2001

24 Hansen A, "Astigmatism and surface phenomena in pterygium" 58 : 174-181, 1980

25 Oner FH, "Analysis of the pterygium size inducing marked refractive astigmatism" 10 : 212-214, 2000

26 Klyce SD, "Advantages and disadvantages of the Zernike expansion for representing wave aberration of the normal and aberrated eye" 20 : 537-541, 2004

27 Gridley MJ, "A form of variable astigmatism induced by pseudopterygium" 17 : 794-795, 1986