Prescriptions

I've been looking over my records for the past several years.  My eyeglasses prescription seems to have changed fairly drastically (about 4-5 diopters) since 1995 when I was 15, but my contact lens prescription has hardly changed at all (about 1 diopter per eye).  What explains this?  (I figured that the glasses prescriptions may be somewhat inconsistent because the distance at which the lens sits from the eye can vary significantly between prescriptions, no? Whereas the contact lens always sits in the same spot so you get a better picture of how your prescription's changing.)

Thanks!

[John C Hagan III, MD, FACS, FAAO]

Something isn't right. If your glasses RX is plus or minus 4 diopters  and your contacts are plus or minus 1 diopters one or the other is incorrect. Nothing would account for that big of a difference.

JCH MD