How can you get temporary blurred vision? what can cause it?

Dry Eye Syndrome: The most common cause of temporary or fluctuating blurred vision is dry eye syndrome. Our tear production decreases by 60% from age 16 to age 60. Other causes of dry eye include various medicines, smoking, certain auto-immune diseases, environmental causes such as forced air heating and air conditioning. You should certainly see an eye md to rule out any serious causes.