近视青少年单眼角膜塑形术后脉络膜厚度变化

目的：观察配戴角膜塑形镜前后脉络膜厚度及眼轴长度的变化并探讨脉络膜在延缓近视发展中的作用。方法：自身对照研究。收集2018年8月至2019年6月于沈阳爱尔眼视光医院就诊并验配角膜塑形镜的单眼近视青少年患者26例（52眼），将配戴角膜塑形镜眼作为观察组，另一眼未作处理作为对照组，测量戴镜前及戴镜后6个月的眼轴长度和脉络膜厚度。采用配对t检验分析戴镜前后眼轴长度、脉络膜厚度的改变以及组间眼轴长度、脉络膜厚度的变化值。结果：配戴角膜塑形镜6个月，观察组各位点脉络膜厚度均较前增厚（P<0.05），对照组各位点脉络膜厚度均较前变薄（P<0.05）。2组之间戴镜前后各位点脉络膜变化值差异均有统计学意义（P<0.05）。2组眼轴长度均较前增长（P<0.05），观察组眼轴长度增长量为（0.09±0.15）mm，对照组为（0.26±0.16）mm，2组之间差异有统计学意义（t=-4.024，P<0.001）。结论：对于近视青少年，配戴角膜塑形镜可以使脉络膜增厚，眼轴长度增长减缓，这可能是角膜塑形镜控制近视发展的原因之一。

Changes in Choroidal Thickness in Myopic Adolescents after Monocular Orthokeratology Treatment

Objective: To observe the changes in choroidal thickness (CT) and axial length (AL) before and after wearing orthokeratology lenses and to investigate the role of the choroid in slowing the progression of myopia. Methods: This was a self-control study. From August 2018 to June 2019, in which 26 monocular myopic adolescents (52 eyes) who were treated with orthokeratology lenses in Shenyang Aier Eye Hospital were recruited. The eyes fitted with orthokeratology lenses served as the experimental group, while the fellow eyes without treatment served as the control group. AL and CT were measured in both groups at baseline and the 6-month visit. A paired t-test was used to analyze AL and CT before and after wearing orthokeratology lenses and the changes were compared between the 2 groups. Results: After 6 months of wearing orthokeratology lenses, the CT of the experimental group increased in all positions (all P<0.05), and the CT of the control group decreased in all positions (all P<0.05). There was a statistically significant difference in the changes in CT between the 2 groups before and after wearing orthokeratology lenses (all P<0.05). The AL in both groups increased significantly (both P<0.05). AL elongation was 0.09±0.15 mm in the experimental group and 0.26±0.16 mm in the control group, and there was a statistically significant difference between the 2 groups (t=-4.024, P<0.001). Conclusions: For myopic adolescents, wearing orthokeratology lenses can thicken the choroid and slow axial growth, which may be one of the reasons for using orthokeratology lenses to control the progression of myopia.