There are many factors that can lead to blurry eyes: over fatigue, low blood pressure, hardening of blood vessels, or posterior vitreous detachment. 1. Excessive fatigue: When the body is too tired, the blood flow will become slow, which will easily lead to insufficient blood supply to the eyes, thus leading to blinking. 2. Low blood pressure: When the blood pressure is too low, the blood flow will become slower, which will affect the blood supply to the eyes and lead to blinking. 3. Sclerosis of blood vessels: Sclerosis of blood vessels is a sign of aging of blood vessels, which is often accompanied by slowing down of blood flow, resulting in insufficient blood supply to the eyes, and then the patient will have the symptom of watery eyes. 4. Posterior vitreous detachment: usually occurring in highly myopic patients, posterior vitreous detachment will pull on the retina, resulting in abnormal discharge of retinal cells, causing the patient’s eyes to blink. There are many factors that may cause the phenomenon of starry eyes, including cervical spondylosis, retinal detachment and so on. When this happens, the cause should be clarified in time and targeted treatment should be carried out under the guidance of doctors.