Using the new excimer laser photorefractive keratectomy ( prk ) , the molecular bond of the corneal stroma is broken to allow recofiguration of the cornealsurface . this photo - ablation effect can treat severe myopia , astigmatism , and a variety of corneal diseases using photo - therapeutic keratectomy ( ptk ) . the safety , predictability , and long - term stability are well established in major western medical facilities 准分子激光技术在国内、外安全使用十一年，并得到众多医学权威机构的认定，具有安全性及精确度高、可预测性强、长期稳定性好的特点，我院已为几百名近视患者实施了这种手术， 90的患者术后视力达到1 . 0以上。
