Did you know that staring at your computer for even a few hours at a stretch can strain your eyes so much that it can cause blurred vision? While the simplistic explanation for this condition is the inability to see properly doctors define it as a loss of sharp vision. One can develop blurry vision in one or both eyes and may come on suddenly or gradually. Apart from all the other factors like staring at your computer screen blurred vision may also be a normal sign of aging. Depending on the cause blurred vision can begin suddenly and disappear