Mr Magoo, what jason2000 had mentioned did make sense too.
One could have just make a -3D or even -4D prescription to wear rather than using the +2D over the usual -5D glasses. I also strongly believe that Opticians do at times over correct or under correct our vision to make some profits instead of curing the eyesight problem of consumers. Otherwise they wouldn't be in this line of business.
Mr Magoo, how long did it take you to notice the difference of vision improvement after you had used the + - D methods.
Regards,