| Topographic Changes of Posterior Corneal Surface after Photorefractive Keratectomy with Orbscan II(R) Topography. |
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Sung Hyun Kim, Jae Ho Cho, Byung Joo Song |
1Department of Ophthalmology, Hanil General Hospital, Korea.
2Department of Ophthalmology, Hanyang University Hospital, Korea. Song@email.hanyang.ac.kr |
| Orbscan 2(R) 각막형태검사계를 이용한 PRK 후 각막후면의 변화 측정 |
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김성현 ( Sung Hyun Kim ) , 조재호 ( Jae Ho Cho ) , 송병주 ( Byung Joo Song ) |
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| Abstract |
PURPOSE
To investigate the relationship of refraction, geometry of the posterior corneal surface and the residual corneal thickness after excimer laser photorefractive keratectomy. METHODS: Thirty eyes of 15 patients were treated with Star S2 Smooth Scan (VISX, U.S.A.) and followed up for 3 months. The refractive, anteroposterior changes in the posterior corneal surface and residual corneal thickness were measured using slit-scanning topography, Orbscan IIR (Orbtek, Bausch & Lomb) at 1 week preoperatively, and 1 and 3 months postoperatively. RESULTS: Mean forward shift of the posterior cornea surface was 8.83+/-1.34 micrometer, 11.53+/-4.23 micrometer and 14.70+/-3.50 micrometer at 1 week, 1 month, and 3 months respectively. Mean spherical equivalence of posterior cornea was = -7.01+/-0.31 D preoperatively; it changed to -7.17+/-0.47 D, -7.22+/-0.21 D and -7.17+/-0.6 D at 1 week, 1 month and 3 months. The degree of forward shift of posterior corneal surface is correlated with the posterior corneal refractive changes (r=-0.808, P< 0.01). The forward shift of the posterior corneal surface is correlated with the residual corneal thickness (r=-0.483, P< 0.01). CONCLUSIONS: Photorefractive keratectomy significantly influenced the forward shift of the cornea, which is correlated with the residual corneal thickness. |
| Key Words:
Forward shifting;Orbscan IIR topography;PRK |
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