Multiple reasons can lead to blurred vision, which often refers to a lack of sharpness of vision with inability to see exact detail. Abnormalities present at birth such as near or farsightedness that require corrective lenses can causes blurred eyesight. Well, in some cases, permanent or sudden unsharp vision may just be signals to indicate the presence of eye diseases. Further, it can be the complications of the some eyes surgery, like laser surgery, or eye inflammations. Temporary blurring of vision may be a side effect of some medications. If so, you need to see your surgeon to see if you are needed to take some medicine. It is worth mentioning the poor quality of your glasses can also lead to distractions and night vision clarity reduction. Remember to check this. In general, we all have different eyes vision due to our genetic differences and various living habits. As a result, each eye will react to the diseases differently.