hi,i am 26 years old femal, i had vision problem for many years.my left eye power is -7.00 and right is -6.00.i used glasses for this,recently both of my eyes are in pain in some time,last year my doctor suggest me cylindrical power for both my eyes like 0.50. i used this for last year,but with out this i had no other problem .is it any problem?how can i improve my eye vision? suggest me.