Effect of Sub-bowman Keratomileusis on tear function and vision of patients with high myopia
Objective To analyze the effect of Sub-bowman Keratomileusis(SBK)on tear function and vision of patients with high myopia.Methods From June 2017～June 2022,60 patients with high myopia in our hospital were divided into the control group treated with laser-assisted subepithelial keratomileusis(LASEK)and the observation group treated with SBK,with 30 cases(60 eyes)in each group.The grouping method was random lottery,and both groups were observed for 12 months after operation.The tear function,retinal thickness(RT),corneal anterior surface aberra-tion and visual acuity were compared between the two groups.Results In the control group,the average break up time(BUT)was shortened at first and then extended at 1 and 3 months after operation,and it was longer at 6 months after operation than at 1 month after operation(P<0.05).In the observation group,the average BUT before operation and 1 and 3 months after operation was longer than 1 month after operation(P<0.05).The aver-age BUT in the observation group was longer than that in the control group 3 and 6 months after operation(P<0.05).The overall RT of the two groups increased 1 month after operation compared with that before operation,and the observation group was higher than the control group(P<0.05).The root mean square of total higher-order aberrations and fourth-order spherical aberration in the observation group were lower than those in the control group 1 and 3 months after operation(P<0.05).The visual acuity of the observation group was higher than that of the control group 1,3 and 6 months after operation(P<0.05).Conclusion The treatment of high myopia with SBK had little effect on the root mean square of total higher-order aberrations and the fourth-order spherical aberration of patients,which was helpful to improve the overall RT of patients,and the tear function and visual acuity of patients recover faster after operation.
High myopiaExcimer laser in-situ grinding under the anterior elastic layerExcimer laser subepithelial keratomileusisTear functionSight
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