The free movement of the blood from the liver gives the eyes their brightness and shine. When liver blood is abundant the vision is clear and crisp. When it is deficient, the vision is blurred, dry and conditions such as myopia can develop. If the liver fire or yang is rising, heat can get into the eyes and cause them to be red, dry, irritated. If the fire is strong enough to become wind, it may cause the eyes to turn upwards or to move involuntarily.