한국인에서 적절하게 처방된 가스투과경성콘택트렌즈 직경에 여러 안구계측치들이 미치는 영향
Effects of Ocular Parameters on Diameter of Well-fitted Rigid Gas Permeable Lens in Koreans
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목적: 시험착용을 통하여 최종적으로 9.3 mm와 8.8 mm의 다른 크기로 가스투과경성콘택트렌즈가 처방된 두 군에서 안구계측치들이 어떻게 차이가 있었는지를 확인하고자 한다. 대상과 방법: 단일병원, 단일안과의사가 구면 가스투과경성콘택트렌즈(YK spherical lens, Lucid Korea, Bonghwa, Korea)를 처방한 49명 93안을 대상으로 자동각막곡률계(keratometer)로 측정한 가파른 각막굴절률(Ks), 편평한 각막굴절률(Kf), 각막난시(Kast), 각막형태검사(corneal topography)로 측정한 가파른 각막굴절률(Sim Ks), 편평한 각막굴절률(Sim Kf), 각막난시(Sim Kast), 각막수평직경(white to white corneal diameter, WTW), 편심률(eccentricity)을 조사하여 이 중 최종적으로 처방된 콘택트렌즈 직경(8.8 mm, 9.3 mm)과 연관관계가 있는 안구계측치를 분석하였다. 또한 두 콘택트렌즈군의 처방된 렌즈의 후면광학부반경(back optic zone radius, BOZR), 도수(power)의 차이도 분석하였다. 결과: 최종적으로 8.8 mm 40안, 9.3 mm 53안이 모집되었다. 각막굴절률과 편심률이 8.8 mm 군에서 유의하게 높았으며, WTW는 8.8 mm 군에서 유의하게 낮았다. 최종 처방된 BOZR 또한 8.8 mm 군에서 유의하게 낮았다. 각막난시(Kast, Sim Kast)와 렌즈의 도수는 두 군에서 통계적으로 유의한 차이가 없었다. 결론: 각막굴절률이 높고, 편심률이 높고, 각막수평직경이 작은 환자에서 작은 크기의 RGP 렌즈를 처방할 확률이 높았고, RGP 렌즈의 크기가 작아질수록 렌즈의 후면광학부반경은 좀 더 가팔라지는 경향을 보였다.
Abstract
Purpose: To compare the differences of parameters of 9.3 mm and 8.8 mm rigid gas permeable lenses (RGP lenses) that were prescribed by trial lens fitting. Methods: Ninety-three eyes of 49 patients were prescribed RGP contact lenses (YK spherical lens, Lucid Korea, Bonghwa, Korea) by a single ophthalmologist at the same hospital. We analyzed the differences of parameters of 9.3 mm and 8.8 mm rigid gas permeable lenses (RGP lenses) that were prescribed by trial lens fitting. Steep keratometric value (Ks), flat keratometric value (Kf), and corneal astigmatism (Kast) were measured by keratometer. Simulated steep keratometric value (Sim Ks), simulated flat keratometric value (Sim Kf), simulated corneal astigmatism (Sim Kast), white to white corneal diameter (WTW), and eccentricity were measured by corneal topography. We also analyzed the differences of back optic zone radius (BOZR) and lens power between the two groups. Results: In this study, 40 eyes wearing 8.8 mm lenses and 53 eyes wearing 9.3 mm lenses were included. Keratometric value and eccentricity were significantly higher in the 8.8 mm lens group, while WTW and BOZR were significantly lower. Corneal astigmatism (Kast, Sim Kast) and lens power were not significantly different between the groups. Conclusions: RGP lenses with a smaller diameter were likely to be prescribed to patients with higher keratometric value, higher eccentricity, and shorter WTW, and the average BOZR of the prescribed RGP lenses with a smaller diameter was likely to be steeper.
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