I consulted eye checkup last Jan2017 at sankara nethralaya, they gave L -4.0 and R -4.25 so changed my glass then i got slight eye strain to concentrate on object so i tested in rajan eye care they gave L -4.25 n R -4.25 . this prescription got right for my eyes. Last week again i tested in sankara nethralaya, they gave L -4.50 n R -4.50 . Doctor told same power so if u want u can change your glass for latest presc. 1) did 4 to 4.50 makes difference in power 2)should i continue with old or new?