Blurry vision occurs when the sharpness of your eyesight reduces, making objects appear out of focus. It can affect one or both eyes and may develop gradually or, as in this case, suddenly. While temporary blurry vision can result from eye strain or fatigue, sudden blurry vision in both eyes often signals something more serious. Timely intervention is key in such cases, and that’s where understanding the blurry vision causes comes into play.