한국안광학회지 (Journal of Korean Ophthalmic Optics Society)

한국안광학회 (The Korean Ophthalmic Optics Society)
권호 표지

각막형상, 각막난시 및 렌즈 피팅상태와 구면 RGP렌즈의 중심안정위치와의 상관 관계

A Relationship between Corneal Type, Corneal Astigmatism and Lens Fitting States and the Stable Centration of Spherical RGP Lens

  • 임신규 (서울과학기술대학교 안경광학과) ;
  • 이민하 (서울과학기술대학교 안경광학과) ;
  • 최선미 (전북과학대학교 안경광학과) ;
  • 박상희 (가야대학교 안경광학과) ;
  • 김소라 (서울과학기술대학교 안경광학과) ;
  • 박미정 (서울과학기술대학교 안경광학과)
  • Lim, Shin Gyu (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Lee, Min Ha (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Choi, Sun Mi (Dept. of Optometry, Jeonbuk Science College) ;
  • Park, Sang Hee (Dept. of Ophthalmic Optics, Kaya University) ;
  • Kim, So Ra (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Park, Mijung (Dept. of Optometry, Seoul National University of Science and Technology)
  • 투고 : 2012.05.14
  • 심사 : 2012.06.16
  • 발행 : 2012.06.30
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초록

목적: 각막형상이나 각막난시도, 피팅상태가 구면 RGP 렌즈를 피팅함에 있어서 각막 중앙안정위치(stable centration)에 어떠한 영향을 미치는지를 밝히고자 하였다. 방법: 각막난시가 0.00~2.75 D인 원형 각막 29안 및 대칭나비형 각막 45안을 대상으로 RGP 렌즈를 양호한 피팅상태, 스팁한 피팅상태, 플랫한 피팅상태로 착용시키고 각막에서의 렌즈 위치를 촬영하여 분석하였다. 결과: 구면 RGP 렌즈의 수직방향 렌즈 안정 위치는 모든 경우에 아래 쪽으로 중심이탈되었으며 중심이탈 정도는 일관성이 없었다. 수평방향의 렌즈 안정위치는 렌즈의 베이스커브가 커짐에 따라 귀 쪽으로 렌즈 중심이 이탈되는 정도가 통계적으로 유의하게 커졌으며 각막형상과 난시도, 피팅상태에 따라 렌즈 중심의 이탈 정도에 차이가 있었다. 동일한 난시도를 가진 원형 각막은 대칭나비형 각막에 비해 렌즈 중심이 귀쪽방향으로의 이탈 정도가 더 컸다. 결론: 구면 RGP 렌즈의 피팅상태, 난시도 및 각막형상에 따라 중심안정위치가 달라지며 이를 고려하면 RGP 렌즈 처방 시 성공률을 높일 수 있을 것으로 보인다.

Purpose: The present study was conducted to investigate whether there is any difference in the centration of spherical RGP lens on cornea according to corneal types, corneal astigmatism and lens fitting states. Methods: Spherical RGP lens was fitted on 29 eyes of round-typed cornea and 45 eyes of symmetric bowtie-typed cornea with 0.00~2.75 D of corneal astigmatism in alignment, steep or flat. Their lens centrations on cornea were analyzed by taking photographs. Results: The centration of spherical RGP lens in the vertical direction was decentrated to downward direction in all cases, and the degree of decentration was not consistent. The lens centration in horizontal direction was significantly more-decentrated to the temporal meridian as base curve of lens was increased, and the degree of decentration was different according to the corneal type, corneal astigmatism and fitting states. With the same degree of astigmatism, the lens decentration to the temporal meridian was bigger in round-typed cornea than that in symmetirc bowtie-typed cornea. Conclusions: The centration of spherical RGP lens varies depending on lens fitting states, corneal astigmatism, and corneal types. Thus, the consideration of these factors may improve the success rate in RGP lens prescription.

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참고문헌

  1. Brennan NA, Lindsay RG, McCraw K, Young L, Bruce AS, Golding TR. Soft lens movement: temporal characteristics. Optom Vis Sci. 1994;71(6):359-363. https://doi.org/10.1097/00006324-199406000-00001
  2. Park KA, Mah KC, Lee HJ, Yi MH, Kim YM, Bae HJ. The effects on the fitting characteristics of diameter change in spherical RGP contact lens. Korean J Vis Sci. 2007;9(1):79-88.
  3. Kim JM, Kim SH. Comparison of preference and empirical fit success rates for spheric and aspheric RGP lenses. J Korean Oph Opt Soc. 2008;13(2):9-16.
  4. Kim SR, Park SI, Lee SE, Park M. A comparison of lens centrations on cornea with RGP lens fitting by the measured values using keratometer and corneal topography. J Korean Oph Opt Soc. 2011;16(1):41-50.
  5. Park EH, Kim SR, Park M. The comparison of fluorescein patterns between spherical RGP lens and aspherical RGP lens by corneal type and astigmatic degree. J Korean Oph Opt Soc. 2012;17(1):37-45.
  6. Kim SR, Gil JY, Park CW, Kim JH, Park M. The analysis of corneal patterns in Korean 20s by corneal topography and corneal radii by astigmatic degree. J Korean Oph Opt Soc. 2011;16(3):273-281.
  7. Bogan SJ, Waring GO, 3rd. Ibrahim O, Drews C, Curtis L. Classification of normal corneal topography based on computer-assisted videokeratography. Arch Ophthal. 1990;108(7):945-949. https://doi.org/10.1001/archopht.1990.01070090047037
  8. Chan JS, Mandell RB, Johnson L, Reed C, Fusaro R. Contact lens base curve prediction from videokeratography. Optom Vis Sci. 1998;75(6):445-449. https://doi.org/10.1097/00006324-199806000-00028
  9. Hogben CA. A practical and simple equivalent for student's T test of statistical significance. J Lab Clin Med. 1964;64(2):815-819.
  10. Huck SW, McLean RA. Using a repeated measures ANOVA to analyze the data from a pretest-posttest design: a potentially confusing task. Psychological Bulletin. 1975;82(4):511-518.
  11. Kim SJ. A comparison and study on the results of ANOCOVA for the repeated measure data by 'general linear model' and 'mixed model'. Master thesis. Chonnam National University, Gwangju. 2006;1-30.
  12. Sorbara L, Fonn D, Holden BA, Wong R. Centrally fitted versus upper lid-attached rigid gas permeable lenses. Part I. Design parameters affecting vertical decentration. International Contact Lens Clinic. 1996;23(3):99-104. https://doi.org/10.1016/0892-8967(96)00030-2
  13. Carney LG, Mainstone JC, Carkeet A, Quinn TG, Hill RM. Rigid lens dynamics: lid effects. CLAO J. 1997;23(1):69-77.
  14. Carney LG, Mainstone JC, Quinn TG, Hill RM. Rigid lens centration: Effects of lens design and material density. International Contact Lens Clinic. 1996;23(1):6-12. https://doi.org/10.1016/0892-8967(95)00094-1
  15. Quinn TG, Carney LG. Controlling rigid lens centration through specific gravity. International Contact Lens Clinic. 1992;19(3):84-88.
  16. Kim DH, Mah KC, Kim DS, Lee HJ. The movement of RGP contact lens related to blinking velocities. Korean J Vis Sci. 2007;9(2):225-240.
  17. Tomlinson A, Schwartz C. The position of the corneal apex in the normal eye. Am J Optom Physiol Opt. 1979;56(4):236-240. https://doi.org/10.1097/00006324-197904000-00004
  18. Cardona G, Isern R. Topography-based RGP lens fitting in normal corneas: the relevance of eyelid and tear film attributes. Eye Contact Lens. 2011;37(6):359-364. https://doi.org/10.1097/ICL.0b013e318232e431
  19. Nosch DS, Ong GL, Mavrikakis I, Morris J. The application of a computerised videokeratography(CVK) based contact lens fitting software programme on irregularly shaped corneal surfaces. Cont Lens Anterior Eye. 2007;30(4):239-248. https://doi.org/10.1016/j.clae.2007.06.003