| Effects of Ocular Parameters on Diameter of Well-fitted Rigid Gas Permeable Lens in Koreans. |
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Min Seon Park, Young Kee Park, Sang Mok Lee |
1Department of Ophthalmology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea. lsm10003@gmail.com
2YK Eye Clinic, Seoul, Korea. |
| 한국인에서 적절하게 처방된 가스투과경성콘택트렌즈 직경에 여러 안구계측치들이 미치는 영향 |
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박민선1⋅박영기2⋅이상목1 |
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한림대학교 의과대학 한림대학교성심병원 안과학교실1, YK 안과의원2 |
Correspondence:
Sang-Mok Lee
Email: lsm10003@gmail.com |
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Received: 8 June 2017 • Revised: 9 August 2017 • Accepted: 31 August 2017 |
| 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. |
| Key Words:
Back optic zone radius;Corneal diameter;Eccentricity;Keratometric value;Rigid gas permeable (RGP) lens |
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