How long does the recovery of corneal sensitivity in different corneal regions take after LASEK?

AIM:To determine the corneal sensitivity recovery period after laser-assisted sub-epithelial keratectomy(LASEK)refractive surgery and investigate the effects of ablation depth on it.METHODS:In this study examinations were performed on 90 right eyes of 90 people(34 males and 56 females)with an age range of 20-35 and an average of 22.26±3.8 years old.A sensation of 5 corneal regions,including the center and 4 mid-peripheral regions,i.e.,nasal,inferior,temporal,and superior,each at a distance of 2 mm from the center of the cornea were measured with a Cochet-Bonnet esthesiometer device in 3-time points including before LASEK,1 and 3mo after the surgery,respectively.LASEK was performed on individuals with stabilized myopia of -1.00 to -7.00 diopters and astigmatism of less than 2.00 diopters.Furthermore,the individuals were divided into three groups regarding ablation depth.RESULTS:The highest level of corneal sensitivity before surgery was related to the center of the cornea(59.1±7.76),and the highest level of corneal sensitivity loss was also related to this region.The sensation of all measured corneal regions significantly reduced 1mo postoperatively and returned to their preoperative levels 3mo after surgery(mean of 5 corneal regions in levels of preoperation:58.2±6.48,1mo postoperation:57.3±5.84,3mo postoperation:58.2±5.49;P<0.05).A significant relationship was found between ablation depth and corneal sensitivity changes in the center and temporal regions(P<0.05).CONCLUSION:Corneal sensitivity in myopia and low astigmatism decreases after LASEK and reaches the preoperative level within 3mo.The depth of ablation during surgery affected the recovery of corneal sensitivity.

Implantable collamer lens for residual refractive error after corneal refractive surgery

AIM：To assess the safety,efficacy,predictability and stability of implantable collamer lens（ICL） for residual refractive error after corneal refractive surgery.METHODS： This study evaluated 19 eyes of 12 patients who underwent ICL implantation after corneal refractive surgeries.They were followed up for 1y to 5y of uncorrected distance visual acuity（UDVA）,corrected distance visual acuity（CDVA）,manifest refractive error,flat and steep K value,axial length,intraocular pressure,corneal endothelial cell density,adverse events after ICL surgery.RESULTS： The mean follow-up period was 39.05 ±19.22 mo（range,1-5y）.Spherical equivalent refractive error changed from-7.45±3.02 D preoperatively to-0.85±1.10 D 1wk to 1mo after ICL implantation,with the safety and efficacy indices being 1.12 and 1.15,respectively.A total of 52.63% of eyes were within ±0.5 D of the predicted spherical equivalents,73.68% were within ±1.0 D.A trend of mild regression towards myopia with axial elongation after 5y was observed.One eye with mild anterior capsule opacity and retinal detachment 1y after surgery were observed.CONCLUSION： ICL implantation is safe and effective for the correction of residual refractive error after corneal refractive surgeries,especially in moderate to high residual myopia.

硅水凝胶角膜接触镜在乙醇法-和机械法-激光上皮下角膜磨镶术术后的应用

目的评价Galyfilcon A硅水凝胶软性角膜接触镜(acuve advance)作为乙醇法-准分子激光上皮下角膜磨镶术(laser subepithelial keratomileusis,LASEK)和机械法-激光上皮下角膜磨镶术(epi-laser in situ keratomileusis,epi-LASIK)术后绷带式接触镜应用的临床安全性和有效性。方法31例(58眼)行LASEK或epi-LASIK的患者参与了本前瞻性临床研究,其中9例双眼行LASEK手术者作acuve advance和月抛型镜片的对照研究,其余22例均使用acuve advance镜片。根据角膜上皮愈合的情况,镜片连续配戴3 d或7 d。在术后第1天、第3天和第7天,观察镜片的中心位置、移动度、湿润度和沉淀物,在裂隙灯下对角膜缘充血和角膜上皮水肿情况进行评分,并由患者对其不适感(疼痛和异物感)行主观量化评分。结果Acuve advance的镜片中心位置、移动度、湿润度均良好,常见散在沉淀物。大部分患者疼痛感无或很轻,而异物感是主要症状。与月抛型镜片相比,术后第1天和第3天的戴acuve advance者异物感更轻(Z=2.72,P=0.007;Z=2.37,P=0.018);戴acuve advance者术后第1天的疼痛感更轻(Z=2.60,P=0.009);戴acuve advance者术后角膜缘充血与角膜上皮水肿也略轻,但差异无显著性。未发生严重并发症。结论Galyfilcon A硅水凝胶软性角膜接触镜作为LASEK和epi-LASIK术后绷带式接触镜应用是安全有效的,与月抛型镜片相比,更适合于长期配戴。