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Few people do not have the same prescription in each eye, but the lenses used in stock reading glasses always have the same power. Some people have an astigmatism, which is not be corrected by using stock reading glasses. Using reading glasses to correct an astigmatism could lead to blurry vision and nausea. Stock reading glasses, especially the less expensive array found in pharmacies and superstores, use lesser grade plastic lenses that may not be made properly. These plastic lenses could be fuzzy or have bubbles that impair your vision. This is why it is best to see your eye doctor to check which degree of readers you need and if stock reading glasses are viable or if you require custom reading glasses instead.

Just like regular eyeglasses, reading glasses are available either with a full frame, a half-frame or as no-frame rimless reading glasses. Half-frame reading glasses and rimless reading glasses are pragmatic because it is easier to look over the top of the frame when switching from close-up to distance viewing. Rimless reading glasses are very practical because your eyes do not have negotiate around the frame when looking up. The edge of the lens does not obstruct your vision the way an eyeglass frame does. Those that purchase reading glasses for reading their computer monitor often find that reading glasses make it harder to actually see the screen. This can cause someone to shift their posture which can lead to neck strain, back strain and eye strain which only diminishes your eyesight and ultimately progresses your prescription.