My 4 year and 6 month son have very his eye power and low vision. Eye power is left eye sph: -10, cyl -4, axis 170 va6/24 & right eye sph -10, cyl -3.75 axis 20 & va 6/18p even with glasses, he is not able to see beyond 6/18. Kindly advise how to get a better vision of 6/6 or at least 6/9.

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