AIM: To compare the progress of binocular myopia with orthokeratology lens in different degrees of unilateral myopia in anisometropic children for 1a.

METHODS:Retrospective case-control study. The data of 60 unilateral myopic anisometropia children, 8-12-year-old patients who fitted with orthokeratology lens in Xi'an No.1 Hospital from June 2018 to June 2019 were collected. The binocular spherical equivalent(SE)difference ≥2.5D was found in 30 cases in the high anisometropia group, and 1.0D≤ binocular SE difference <2.5D was found in 30 cases of the low anisometropia group. The patients in the two groups were observed and compared after wearing lens for 6mo and 1a of the changes of binocular axial length(AL)and SE without-lens eyes.

RESULTS: At the follow-up at 6mo and 1a, the growth of AL in the high anisometropia group with orthokeratology lens was less than that in the low anisometropia group(P<0.001). The amount of growth of AL without-lens eyes and the growth of SE were greater than that in the low anisometropia group(all P<0.001), and the shortening range of the binocular AL in the high anisometropia group was greater than that in the low-degree anisometropia group(P<0.05). The correlation analysis showed that the anisometropia and the shortening of axial difference were correlated(F=0.293, 0.458, all P<0.001).

CONCLUSION: In anisometropia children with unilateral myopia, after wearing the orthokeratology lens, the progression in high anisometropia group was slower than low anisometropia after wearing the orthokeratology lens, but the progression of AL without-lens eyes and SE was faster than low anisometropia. Wearing orthokeratology lens can effectively reduce anisometropia, and the greater degree of the anisometropia the more binocular axial difference was narrowed, the more binocular axial difference was narrowed.