An eye examination by od showed -2.00 left eye for glasses. but, it was -3.25 two yrs. earlier and -3.50 three yrs. ago. prescription not made yet. re-exam?

I would : Re-exam sounds like a good idea. When we see this kind of fluctuation we also consider the possibility of diabetes.

Rx check: Transcription errors occur, though in a younger myope, over-minus prescriptions are often the result of a too quick refraction and unclear endpoint. If you really want to know how low you can go, ask for a cycloplegic refraction to determine the baseline without the variable effect of focusing during the evaluation. Most opticians offer a 30 day grace period to account for "dr. Error.".