English to Russian Medical Medical (general)

What impact does lens centration have on the outcome?
Good lens centration and fitting is needed to ensure that the lenses can be comfortably worn without impacting on the child’s day to day activities.
There is no specific data available on the impact of centration on the efficacy.
If the refraction is on the cusp, is it better to slightly under correct or over correct?
We would recommend choosing the maximum plus power that provides no detriment in visual acuity (VA).