Monitoring the role of orthokeratology lens in the prevention and control of myopia in adolescents by eye axis measurement
Objective To analyze and explore the role of orthokeratology lens in the prevention and control of myopia in adolescents by eye axis measurement.Methods 93 cases of adolescent myopic children were divided into an observation group(49 cases,88 eyes)and a control group(44 cases,88 eyes)according to different treatment methods.The control group wore frame glasses,and the observation group wore orthokeratology lens,and was monitored by eye axis measurement.Comparison was made on changes of naked eye visual acuity,intraocular pressure,optic axis,diopter and corneal curvature were observed in the two groups before and after wearing the lenses for 6 and 12 months,the changes of corneal topographic parameters before and 12 months after wearing lenses in the observation group,as well as optic axis growth at 12 months after wearing the lenses between the two groups.The linear correlation of diopter with optic axis,corneal curvature and intraocular pressure was analyzed.Results Before wearing the lenses,there was no difference in naked eye visual acuity,intraocular pressure,optic axis and diopter between the two groups(P>0.05),and at 6 and 12 months after wearing the lenses,the naked eye visual acuity,intraocular pressure,optic axis and diopter of the observation group were better than those of the control group(P<0.05).Before wearing the lenses,there was no difference in flat K and steep K between the two groups(P>0.05).At 6 and 12 months after wearing the lenses,the flat K and steep K of the observation group were(40.96±1.12),(41.10±1.13)D and(42.05±1.12),(42.28±1.15)D,which were lower than(42.63±1.22),(42.70±1.24)D and(43.67±1.38),(43.77±1.38)D of the control group(P<0.05).At 12 months after wearing the lenses,the flat K and steep K of the observation group were lower than before wearing the lenses(P<0.05).At 12 months after wearing the lenses,the flat K and steep K in the corneal center 0-3 mm were significantly lower than those before wearing the lenses in the observation group(P<0.05).At 12 months after wearing the lenses,the corneal irregularity measurement(CIM)and shape factor(SF)in the observation group were better than those before wearing the lenses(P<0.05).Multiple linear regression analysis showed that refraction showed a negative correlation with optic axis and corneal curvature flat K(P<0.05),and the optic axis was the most influential factor;while diopter had no significant correlation with intraocular pressure and corneal curvature steep K(P>0.05).The 12-month optic axis growth in the observation group was(0.2313±0.12722)mm,which was significantly lower than(0.3795±0.14125)mm in the control group(P<0.05).Conclusion The results of optic axis monitoring show that orthokeratology lens can play a good role in the prevention and control of myopia in adolescents.
Eye axis measurement and monitoringOrthokeratology lensAdolescent myopiaPrevention and control effect
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