Study on the myopia control effect of OK lens on children with different corneal curvature

Abstract Objective: To explore the effect of OK lens on myopia control in children with different corneal curvature. Method: A total of 178 myopic children admitted to our hospital from April 2019 to July 2021 were selected and grouped according to the baseline (at enrollment), and the children were divided into three groups, namely axial group (corneal curvature 41.5D, n=58), curvature group (corneal curvature 44D, n=55), and mixed group (41.5D corneal curvature 44D, n=65). All the children were treated with ok lens; comparing the growth rate of refraction, axial length, corneal curvature and axial axis respectively, and analyzing the prevention and control effect of myopia in different cycles and whether the prevention and control effect of different types of myopia were different. Result: The axis and refraction of the three groups improved within 2 years after wear, but the corneal curvature in the three groups showed a decreasing trend; After comparing the refraction, corneal curvature and axial length after wear, the refraction, corneal curvature and axial length were significantly better than those before wear (P <0.05). The growth rate of the axial axis of patients in the half-annual cycle decreased significantly, and the increase of axial axis also showed a decreasing trend. The difference between the increase of axial axis in the half year, 1 year, 1.5 years and 2 years after wearing the mirror was not significant (P> 0.05). In addition, corneal curvature in all patients in the study decreased after lens wear, and there was significant differences in corneal curvature between the axial and curvature groups (P <0.05). At the same time, the axial growth was significantly higher than that in the curvature and mixed groups (P <0.05). Conclusion: There is a close correlation between corneal curvature and the effectiveness of OK lens treatment. Compared to children with flat corneal curvature, OK lens has a more ideal effect on controlling the axial length of the eyes in children with steep corneal curvature, but has less impact on naked eye vision.