how many times has it happened? does it clear up and return ? what are your medications? do you also have high blood pressure? bruise easily?
What you get is called a subconjunctival hemorrhage. While its appearance can be alarming, it isn't a serious problem. It happens when a blood vessel in the conjunctiva (the white part of the eye) breaks and releases blood. This often tends to occur after frequent sneezing, coughing, after rubbing the eye or for no apparent reason. It tends to happen more frequently in people who have high blood pressure or you use blood thinning medicines, such as asprin, motrin, plavix, vitamin e, coumadin, among others. Vicoprofin is another one of the meds that can cause thinning of your blood. The blood will be reabsorbed into the body within a week or so. There is nothing you can do to make it go away sooner. Usually, there is a sensation of the eye feeling slightly full, or a mild pressure sensation and using artificial tears can help with this symptom. I hope you find this helpful, Dr. Stevens
This link has a pic of a very small hemorrhage