Blurry vision can be caused by various factors, including refractive errors like nearsightedness, farsightedness, or astigmatism. These conditions occur when the shape of the eye prevents light from focusing directly on the retina. Age-related changes, such as presbyopia, can also lead to blurry vision, making it harder to focus on nearby objects. Other causes include eye fatigue, dry eyes, eye infections, and certain medications. Systemic conditions like diabetes, high blood pressure, or autoimmune disorders may affect the blood vessels and nerves in the eyes, leading to vision problems. It is important to consult an eye care professional to determine the underlying cause and receive appropriate treatment.