There are many factors that can cause bleeding behind the eye. It is usually caused by Diabetic Retinopathy and Vitreous Hemorrhage. The abnormal new blood vessels that grow on the retina will also cause bleeding behind the eye.
Your mother might have Diabetic Retinopathy, which is a condition that interferes with the body's ability to use and store sugar. Over time, Diabetes may cause weakening of the small blood vessels found in the retina. These blood vessel changes are called Diabetic Retinopathy. Early stages of this cause Backround Retinopathy, causing small hemmorhages to form thoughout the retina the more progressive this gets the more prone it is to bleed. sudden loss of vision.