Patients can see obvious bleeding from the appearance, mostly surface bleeding, deep bleeding from the appearance of the actually can not be seen. Bleeding that can be seen on the surface is mostly subconjunctival bleeding, because the cornea itself does not have blood supply, that is, the black eyeballs will not bleed, the bleeding is the location of the white eyeballs. The surface of the membrane to provide nourishment is called the conjunctiva, generally subconjunctival hemorrhage is mostly due to cold and heat, cough, constipation, fever, and systemic diseases, and a few such as blood diseases, anemia, and so on. Subconjunctival hemorrhage itself will not cause any effect on the eyeball, because it is only the surface of the blood vessels, but there is a possibility of recurrent episodes of such bleeding is painless and itchy, there is no sensation, and it will be absorbed by itself after a while. When it affects the appearance, you can also order lubricants, such as artificial tears that will help somewhat. If subconjunctival hemorrhage occurs in both eyes, you should still go to the ophthalmology department to do fundus examination, to exclude whether there is any fundus hemorrhage, systemic diseases.