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If you're near the age of 40, you may have already experienced problems with reading anything closer than arm's length. If so, you probably have presbyopia.
Presbyopia, caused by a rigidity of the crystalline lens, robs the lens of its ability to properly focus light passing through the eye. Presbyopia is usually noticeable just before age 40 and becomes more pronounced with time.
You may need glasses only for reading, sewing or close work unless other vision conditions also affect your eyes. Many vision conditions, including presbyopia, can also be corrected with contact lenses.
You doctor will recommend what is right for your vision condition.
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