May not be glasses: At your age you may have dry eye, prolonged visual tasks can decrease your blink rate up to 70% resulting in that "tired" feeling.
Answered 6/9/2013
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Possibly: You may need new glasses but the most common cause of this issue is dry eye or ocular surface irritation from any cause. Try using artificial tears, ointment at night, warm compresses, and omega-3 fatty acid supplements.
Answered 12/26/2012
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