METHODS: We selected 120 children with myopia aged 8-14 years old(240 eyes), treated in Ophthalmology Clinic of the First Affiliated Hospital of Baotou Medical College from June 2018 to December 2018. They were divided into three groups as follows: low concentration atropine group, orthokeratology group, and spectacles group. The accommodative lag, positive relative accommodation, negative relative accommodation, and diopter were followed up at 1, 3, 6, 12mo.

RESULTS:During the follow ups of 3, 6, and 12mo. We observed a statistically significant difference in the accommodative lag between the orthokeratology group and low concentration atropine group spectacles group(P<0.05). At the 6, 12mo follow up, there was a statistical difference in the accommodative lag between the orthokeratology group and the spectacles group(P<0.05). During the follow ups of 3, 6, and 12mo, there was a statistically significant difference in negative relative accommodations among the low concentration atropine group, orthokeratology group, and spectacles group(P<0.05). The difference in positive relative accommodations was statistically significant among the orthokeratology group, low concentration atropine group, and spectacles group at each time point during the follow ups(P<0.05). During the follow ups of 6, 12mo,the difference of equivalent spherical lens was statistically significant among the low concentration atropine group and spectacles group(P<0.05). At the follow up 12mo, the difference between the equivalent spherical lens of the orthokeratology group and the spectacles group was statistically significant(P<0.05).

CONCLUSION: The effects of three commonly used methods of controlling myopia on the accommodation parameters of myopic children are as follows: orthokeratology can not only solve the problem of hyperopia defocus by reducing accommodation lags but also improve positive relative accommodations, while it should be worn for a prolonged period. Low concentration atropine can improve the negative relative accommodations. However, there may be other ways to control myopia development. Compared to other groups, the spectacles group exerted fewer effects on each adjustment index, and did not demonstrate a significant effect on myopia control.