Sir, my sister is suffering from myopia. left eye- "-6.5" and right eye - "-7 "... and is still getting weaker..pls suggest something how to deal it?

Myopia: To some extent, myopia is inherited, but there is some research that suggests that the degree of myopia can be influenced by long periods of reading. Encourage her to take breaks every 30 minutes and look at something far away out the window for 30 seconds or more-- this will allow the eyes to relax their focus and perhaps may prevent further worsening of the eyes.