青少年近视配戴角膜塑形镜后的对比敏感度研究

目的青少年近视在我国有极高的发病率,而角膜塑形镜是目前改善视觉质量的重要方法。文中主要分析青少年近视眼配戴角膜塑形镜后的对比敏感度(contrast sensitivity,CS)改变。方法配戴角膜塑形镜组患者为64例120只眼,年龄7～20岁,平均年龄(10.21±2.62)岁。屈光度为≤-6.00D,最佳矫正视力≥1.0。将角膜塑形镜组按屈光度不同又分为3个亚组:A组(≤-2.00D)36只眼;B组(-2.25D～-4.00 D)52只眼;C组(-4.25 D～-6.00 D)32只眼。对照组患者60例120只眼,为视力正常者,年龄7～19岁,平均年龄(10.43±3.01)岁,裸眼视力≥1.0。所有患者均行CS值测定,对各组患者空间频率、组间及戴角膜塑形镜前后的变化进行比较。结果①青少年近视的CS在各空间频率区均有不同程度的降低(P<0.01)。②角膜塑形镜组的各亚组间仅在中频区差异有统计学意义(P<0.01)。③3个不同屈光度的亚组戴镜后的CS值较戴镜前有提高,但与各空间频率比较差异均无统计学意义(P>0.05)。结论青少年近视会造成全频区CS值的下降。

Comparative analysis of contrast sensitivity of adolescent orthokeratology lens wearers

Objective Adolescent myopia has a high incidence rate in China,and orthokeratology lens can improve the vision quality.This study focuses on the changes of contrast sensitivity(CS) in young patients wearing orthokeratology lens.MethodsWe included in this study sixty-four 7 to 20 years old patients with myopia in 120 eyes,who were all orthokeratology lens wearers.The diopter of the patients was ≤-6.00 D,and the best corrected visual acuity was ≥1.0.Based on diopter,the 120 eyes were divided into groups A(≤-2.00 D),B(-2.25 to-4.00 D) and C(-4.25 to-6.00 D).Another sixty 7 to 19 year-olds(120 eyes) with normal visual acuity(naked vision ≥1.0) were enlisted as controls.We performed the CS test for all the subjects and compared spatial frequencies among different groups as well as before and after orthokeratology lens wearing.Results Compared with the normal controls,the young myopia patients showed markedly reduced CS in all spatial frequency zones(P<0.01),with statistically significant difference among the three diopter groups only in the intermediate frequency zone(P<0.01).Orthokeratology lens wearing obviously improved CS,but with no significant difference as compared with different spatial frequencies(P>0.05).Conclusion Adolescent myopia reduces CS in all spatial frequency zones.