What can i do to improve my child's nearsightedness?

Maybe slow progress: There is really nothing simple that can "improve" nearsightedness until the child is old enough (probably 21 years) to consider laser refractive surgery. There is some information that bifocal glasses, an eyedrop called atropine, and leaving mild myopic glasses off for reading and computer use may help slow the increase of myopia as a child ages. Glasses and contact lenses are the best options.

You can't: There is no reasonable way to slow the progression of myopia in children and adolescents. Atropine and other drops in this category may slow somewhat, but the side effects are generally intolerable.