Well, generally speaking, subconjunctival hemorrhage in some serious cases can lead to blindness. First, you should know that subconjunctival hemorrhage is similar to an ordinary bruise on the skin and it's like a bruise of the eye. It usually appears as a single, concentrated spot of red, or many scattered red splotches, on the white of the eye. In many cases, it can be harmless. And it can disappear by them. But on the other hand, you should know that because they are related to the bleeding in your eyes, so it can lead to blindness, if the situation becomes worse. So if you suffer some bleeding in your eyes because of subconjunctival hemorrhage, it can be an alarm. So at this moment, you must go to hospital and see an eye doctor as soon as possible, or it will be dangerous.