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为研究ＰＲＫ术后角膜中央岛（ｓｔｅｅｐｃｅｎｔｒａｌｉｓｌａｎｄ，ＳＣＩ）的改变及其对视力的影响，探讨其成因和消除方法。对ＰＲＫ后１年以上的７７例（１４６眼）出现角膜ＳＣＩ进行了复习。结果：ＰＲＫ后１周时，出现ＳＣＩ的有４１眼（２８．１％）；１月时为２０眼（１３．７％）；３月时为８眼（５．５％）；６月时为５眼（３．４％）；术后１年时未发现合符标准的ＳＣＩ。ＳＣＩ的屈光度改变有逐渐由陡峭变扁平的趋势，其直径在术后３个月前有逐渐缩小的趋势，但以后的改变趋于稳定。在术后１个月或１个月以上时，存在ＳＣＩ的眼中，最佳视力的丧失比无ＳＣＩ的眼要多（Ｐ＜０．００５）。随着ＳＣＩ的减轻或消失，视力逐渐提高。结论：最佳矫正视力的丧失与ＳＣＩ的形成有关，ＳＣＩ的出现将会延长最佳矫正视力的恢复期
To study the changes of corneal central island (SCI) and its effect on visual acuity (PRK) after PRK, the cause of formation and its elimination were discussed. 77 cases (146 eyes) with corneal SCI more than one year after PRK were reviewed. RESULTS: One week after PRK, there were 41 eyes (28.1%) with SCI, 20 eyes (13.7%) in January, 8 eyes (5.5%) in March, 5 eyes (3.4%). No SCI was found at 1 year after operation. The dioptre change of SCI tended to change gradually from steep to flattened. The diameter of SCI tended to decrease gradually 3 months after the operation, but the change tended to be stable afterwards. At 1 month or more after surgery, there was more loss of optimal visual acuity in the presence of SCI than in those without SCI (P <0.005). With the reduction or disappearance of SCI, visual acuity gradually increased. Conclusion: The loss of best corrected visual acuity is related to the formation of SCI. The appearance of SCI will prolong the recovery of the best corrected visual acuity