Try to disuade him doing excessive mobile
use. However it may be difficult to explain to youngs. Start 'Trifla phant' eye wash prepared of clean and good quality coarse Trifla. If possible get organic fresh corriander bunch and extract it and put few drops in both eyes whenever possible. Let it dry. It may crystallize. Wash with normal water or 'trifla phant' without rubbing. Once you gain regularity you may start noticing changes shortly. Better to use good quality Trifla ghee, saptamrit louh etc orally for strainless and shap vision. If you need any further advise pl consult on private Lybrate chat.