| Influence of Surface Fluid during Photorefractive Keratectomy Using a 213-nm Solid-State Laser. |
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Kwan Soo Kim, Chul Young Choi, Hungwon Tchah |
1Department of Ophthalmology, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Korea. sashimi0@naver.com
2Department of Ophthalmology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea. |
| 213-nm Solid-State Laser 굴절교정각막절제술 시 각막표면 수분의 영향 |
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김관수1ㆍ최철영1ㆍ차흥원2 |
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Department of Ophthalmology, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital1, Seoul, Korea / Department of Ophthalmology, University of Ulsan College of Medicine, Asan Medical Center2, Seoul, Korea |
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| Abstract |
PURPOSE
To investigate the effect of surface fluid on the ablation rate and efficacy of 213-nm solid-state laser during photorefractive keratectomy (PRK). METHODS: Twelve rabbits (24 eyes) underwent myopic PRK for the correction of 10 diopters using 213-nm solid-state laser. Photoablation was performed with removal of corneal surface fluid using the Weckcel(R) sponge every 5 seconds in one eye and without removal of corneal surface fluid in the control eye. The mean central corneal thickness (CCT) was evaluated preoperatively, and at 1 week, 4 weeks postoperatively. RESULTS: The mean CCT of group 1 (with removal of corneal surface fluid) were 361.3+/-13.9 micrometer preoperatively and 321.4+/-18.5 micrometer at 4 weeks postoperatively. The mean CCT of group 2 (without removal of surface fluid) were 358.7+/-8.9 micrometer preoperatively and 338.4+/-12.0 micrometer at 4 weeks postoperatively. The mean ablation depths were 39.8+/-7.4 micrometer in group 1 and 20.3+/-5.8 micrometer in group 2 at 4 weeks postoperatively p<0.05). CONCLUSIONS: Induced corneal surface fluid during PRK may influence the ablation efficacy and accuracy of solid-state laser. This result should be considered in clinical trialswith 213-nm solid-state laser, especially in high myopes. |
| Key Words:
213-nm solid-state laser;Ablation efficacy;Ablation rate;Photorefractive keratectomy;Surface fluid |
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