Blurry vision is a common issue that may arise when structures in the eye such as the retina, cornea, or optic nerve are negatively affected by a particular event or health issue. The slow development and progression of blurred vision is typically caused by chronic medical conditions. Conversely, the sudden onset of blurry vision is usually caused by a specific event that may range from a minor issue (e.g., eye strain) to more serious health problems such as glaucoma or a stroke.