You should visit your eye doctor for several reasons.
Routine eye exams are the only way to detect underlying diseases (i.e. glaucoma) in their early stages. When caught early, they can be more effectively treated before permanent vision loss occurs. Furthermore, the one-size-fits-all reading glasses that you find at a regular store doesn't correct for astigmatism or those with differing eye prescriptions. This is something only an eye doctor, such as Dr. James Evans, can provide.