To evaluate the efficacy and accuracy of photorefractive keratectomy (PRK) for myopia and myopic astigmatism .SVS APEX excimer laser with a wave length of 193 nm(Sumit Technology Inc. Waltham, Mass, USA) was applied. ...To evaluate the efficacy and accuracy of photorefractive keratectomy (PRK) for myopia and myopic astigmatism .SVS APEX excimer laser with a wave length of 193 nm(Sumit Technology Inc. Waltham, Mass, USA) was applied. 316 myopic eyes of 168 patients were treated with PRK between September, 1996 and October, 1997, and 260 eyes (84%) of 150 patients were followed for more than three months, including male 68(116 eyes, 401%) and female 82(144 eyes, 599%). The preoperative spherical equivalent refractive errors ranged from -125D to -1000 (mean -467163D), and astigmatism ranged from 0 to -200D (means -033045D). We divided the patients into two groups according to the referaction: group A (from -125D to -590D) and group B(from -600 to -1000D). The number of eyes in the two groups were 220 and 40 respectively. In group A, on the 10th day, 689% has the uncorrected visual acuity (UCVA) equal to or one line better or lower than the preoperative best corrected visual acuity (BCVA). In 1,3,6 and 12 months, 90 %, 96%, 95% and 94% had the UCVA equal to or one line better or lower than the preoperative BCVA respectively. In group B, on the 10 th day, in 1,3,6 and 12 months, UCVA equal to or one line better or lower than the preoperative BCVA occurred in 359%, 83%, 87%, 86%, and 84% of the cases respectively. Most of the haze showed 051 grades except 3 eyes with the haze of 2 grade in 3 or 6 months and it changed to 1 and 05 grade respectively within one year. In 10 days and 1,3,6,12 months postoperatively, the corneal haze was noted in 329%, 848%, 628%,90% and 28% of the treated eyes respectively. We found that 193 nm excimer laser PRK was a predictable, safe, stable, and effective refractive surgery for correcting myopia up to -1000D in Chinese patients, and the effect was better in myopia lower than -600D.展开更多
目的:报道准分子激光原位角膜磨镶术(laser in situkera-tomileusis,LASIK)术后发生单眼继发性圆锥角膜1例,探讨该并发症的预防及处理。方法:通过病例报告的方法,结合国内外相关情况,分析继发性圆锥角膜发生的原因和有效处理方法。结果:...目的:报道准分子激光原位角膜磨镶术(laser in situkera-tomileusis,LASIK)术后发生单眼继发性圆锥角膜1例,探讨该并发症的预防及处理。方法:通过病例报告的方法,结合国内外相关情况,分析继发性圆锥角膜发生的原因和有效处理方法。结果:1例30岁女性患者行术前检查未发现任何早期圆锥角膜倾向,行常规LASIK7a后视力下降,角膜地形图示左眼角膜曲率明显增大,局部隆起。配戴硬性透氧性角膜接触镜(rigidgas-permeable contact lense,RGPCL)后矫正视力达0.8。结论:详细的术前筛查,术中角膜瓣制作良好和预留足够厚基质床厚度,以及术后的定期随访是预防继发性圆锥角膜的重要措施,在发现圆锥角膜后,及时正确处理对于恢复患者的视力及延缓病程进展至关重要。展开更多
文摘To evaluate the efficacy and accuracy of photorefractive keratectomy (PRK) for myopia and myopic astigmatism .SVS APEX excimer laser with a wave length of 193 nm(Sumit Technology Inc. Waltham, Mass, USA) was applied. 316 myopic eyes of 168 patients were treated with PRK between September, 1996 and October, 1997, and 260 eyes (84%) of 150 patients were followed for more than three months, including male 68(116 eyes, 401%) and female 82(144 eyes, 599%). The preoperative spherical equivalent refractive errors ranged from -125D to -1000 (mean -467163D), and astigmatism ranged from 0 to -200D (means -033045D). We divided the patients into two groups according to the referaction: group A (from -125D to -590D) and group B(from -600 to -1000D). The number of eyes in the two groups were 220 and 40 respectively. In group A, on the 10th day, 689% has the uncorrected visual acuity (UCVA) equal to or one line better or lower than the preoperative best corrected visual acuity (BCVA). In 1,3,6 and 12 months, 90 %, 96%, 95% and 94% had the UCVA equal to or one line better or lower than the preoperative BCVA respectively. In group B, on the 10 th day, in 1,3,6 and 12 months, UCVA equal to or one line better or lower than the preoperative BCVA occurred in 359%, 83%, 87%, 86%, and 84% of the cases respectively. Most of the haze showed 051 grades except 3 eyes with the haze of 2 grade in 3 or 6 months and it changed to 1 and 05 grade respectively within one year. In 10 days and 1,3,6,12 months postoperatively, the corneal haze was noted in 329%, 848%, 628%,90% and 28% of the treated eyes respectively. We found that 193 nm excimer laser PRK was a predictable, safe, stable, and effective refractive surgery for correcting myopia up to -1000D in Chinese patients, and the effect was better in myopia lower than -600D.
文摘目的:报道准分子激光原位角膜磨镶术(laser in situkera-tomileusis,LASIK)术后发生单眼继发性圆锥角膜1例,探讨该并发症的预防及处理。方法:通过病例报告的方法,结合国内外相关情况,分析继发性圆锥角膜发生的原因和有效处理方法。结果:1例30岁女性患者行术前检查未发现任何早期圆锥角膜倾向,行常规LASIK7a后视力下降,角膜地形图示左眼角膜曲率明显增大,局部隆起。配戴硬性透氧性角膜接触镜(rigidgas-permeable contact lense,RGPCL)后矫正视力达0.8。结论:详细的术前筛查,术中角膜瓣制作良好和预留足够厚基质床厚度,以及术后的定期随访是预防继发性圆锥角膜的重要措施,在发现圆锥角膜后,及时正确处理对于恢复患者的视力及延缓病程进展至关重要。
