I've got what appears to be blood on the white of my eye, what is it and should I be concerned?
The sudden appearance of blood in your eye is probably a subconjunctival haemorrhage. Although you may be worried it usually a harmless condition which isn't painful or serious.
The haemorrhage occurs when one of the tiny blood vessels leak under the conjunctiva. It is not known why some vessels leak, it may occur spontaneously or may follow a violent sneeze, cough or vomiting. The blood is usually reabsorbed by the body and disappears within a few weeks. However if you do experience pain or there are any changes in your vision you should see you optometrist immediately.