You cannot buy perfect eyeglasses without knowing the perfect type of your prescription. It is mandatory to discover the right prescription type for your eyeglasses before buying the same. There are three vision ranges viz. Near, Distant, and Intermediate. Also, in its accordance, there are several eye problems. You must know a perfect prescription type to select an appropriate eyeglass that resolves the vision range problems. The table here will help you in selecting a perfect prescription type for you out of single vision lenses, bifocals or progressives.