Comparision of the effect of both-side lasik and lasek for high myopia

Objective To compare the clinic effect of both-side laser in situ keratomilieusis (BSL) and laser epithelial keratomilieusis (LASEK) tbr high myopia with thin cornea and explore their efficacy and safety.Methods BSL and LASEK were treated high myopia patients with corneal thichness between 471 and 546μ m. 51 eyes of 45 patients with average spherical equivalent of-9.71D (range from -8.25 to-13.25D) were treated with BSL.and 67 cases of 39 patients with average SE of-9.26D (range from -8.25 to -12.75D) were treated with LASEK. The uncorrected visual acuity, best corrected visual acuity, spherical epuivalent,haze were examined 10 days. 1、3、6 and 12 months postoperatively.Results Postoperative reaction was mild and UCVA was quickly recovered in BSL group. At 10 days 1,3,6 and 12 months postoperatively, the per- centage of UCVA above BSCVA was 72.55%, 80.39%, 84.31%, 78.43% and 68.63% in BSL group and 47.76%, 65.67%, 71.64%, 70.15% and 61.19% in LASEK group respectively, None patient had 2 lines de- creased. Refraction was changed from over-correction Ⅰ month to under-correction 12 months postoperation. Corneal haze was much higher in LASEK group than BSL, group (P<0.05),but corneal haze was mainly 0.54～1 grades which had no affect on visual acuity. There was no severe complications occurred in-operation and postoporatively.Conclusions The investigation shows that the BSL,with the advantages of the low inci- dence and less severity of haze density and short recovery period, is a safer and better means to treat high my- opia with thin cornea than LASEK. Key words: Both-side Lasik:Lasck-Haze; High myopia; Thin cornea