Read this article we found:
Are books looking blurry? How about computer screens? The issue could be more than just needing a good night’s rest.
Presbyopia usually occurs beginning at around age 40, when people experience blurred near vision when reading, sewing or working at the computer.
Even if you’ve never had vision problems, you can’t escape presbyopia. It’s caused by an age-related process: the gradual thickening and loss of flexibility of the natural lens inside your eye.
With less elasticity, the eye has a harder time focusing up close.
When people develop presbyopia, they often need to hold reading materials at arm’s length in order to focus properly. When they perform near work, such as handwriting or embroidery, they may develop headaches, eye strain or feel fatigued.
It’s interesting to note that women often need correction for presbyopia earlier than men. It’s believed this is because women’s arms are usually shorter than men’s, so when it becomes difficult for them to read at arm’s length, women must turn to presbyopia correction sooner.
Eyeglasses with bifocal or progressive addition lenses are the most common ways to correct presbyopia. Reading glasses are another choice.
Unlike bifocals and PALs, which most people wear all day, reading glasses typically are worn just during close work. If you wear contact lenses, your eye doctor can prescribe reading glasses that you wear while your contacts are in.
http://www.kyforward.com/our-health/2013/12/09/eye-health-books-blurry-trouble-threading-a-needle-happens-to-everyone-over-age-40/
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