Vidaurri-Leal J S, Helena M C, Talamo J H, Abad J C, Alexandrakis G, Cantu-Charles C
Cornea Service, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, USA.
J Cataract Refract Surg. 1996 Oct;22(8):1052-61. doi: 10.1016/s0886-3350(96)80118-0.
To summarize the initial results of excimer laser photorefractive keratectomy (PRK) in 114 eyes of 89 patients using the Coherent-Schwind system and assess its safety, efficacy, and predictability.
Hospital San Jose de Monterrey-ITESM, Mexico.
The Coherent-Schwind Keratom excimer laser was used to correct low myopia (manifest spherical equivalent from -1.00 to -6.00 diopters [D], with manifest cylinder of -1.00 D or less) or myopic astigmatism (manifest spherical equivalent from -2.75 to -6.75 D, with manifest cylinder from -1.00 to -4.50 D) with standard settings. Ablation zone diameters were from 5.9 to 6.3 mm (low myopia) and 5.9 to 8.2 mm (astigmatism) with a repetition rate of 12 Hz. Follow-up was from 1 month (low myopia, n = 71; astigmatism, n = 35) to 6 months (low myopia, n = 36; astigmatism, n = 17).
Six months after PRK, uncorrected visual acuity was 20/40 or better in 94% of the low myopia eyes (n = 36) and 77% of the astigmatism eyes (n = 17). Intended correction was within 1.00 D of the target spherical equivalent in 81 and 88% of eyes, respectively. No eyes in the low myopia group lost two lines of best corrected visual acuity, although 12% in the astigmatism group did.
The Coherent-Schwind excimer laser appears to be effective in the treatment of low myopia and astigmatism, with results comparable to those of other laser systems after 6 months of follow-up. Further study of best corrected visual acuity loss after treatment of compound myopic astigmatism with this laser is warranted.
总结89例患者114眼使用Coherent-Schwind系统行准分子激光屈光性角膜切削术（PRK）的初步结果，并评估其安全性、有效性和可预测性。
墨西哥蒙特雷圣何塞医院-蒙特雷理工学院。
使用Coherent-Schwind Keratom准分子激光，采用标准设置矫正低度近视（明显球镜等效度为-1.00至-6.00屈光度[D]，明显柱镜为-1.00 D或更低）或近视散光（明显球镜等效度为-2.75至-6.75 D，明显柱镜为-1.00至-4.50 D）。消融区直径为5.9至6.3 mm（低度近视）和5.9至8.2 mm（散光），重复频率为12 Hz。随访时间为1个月（低度近视，n = 71；散光，n = 35）至6个月（低度近视，n = 36；散光，n = 17）。
PRK术后6个月，94%的低度近视眼（n = 36）和77%的散光眼（n = 17）的裸眼视力达到20/40或更好。分别有81%和88%的眼的预期矫正度数在目标球镜等效度的1.00 D范围内。低度近视组无眼最佳矫正视力下降两行，尽管散光组有12%的眼出现这种情况。
Coherent-Schwind准分子激光在治疗低度近视和散光方面似乎有效，随访6个月后的结果与其他激光系统相当。有必要进一步研究使用该激光治疗复合性近视散光后最佳矫正视力下降的情况。
