The pathophysiology of this process occurs because the veins above the heart have no valves. A rapid rise in the abdominal pressure induces a rapid rise in the intravenous pressure, and various vessels inside or around the eye may rupture7 . Various straining activities such as heavy lifting, coughing, vomiting, blowing balloons and straining on a stool if constipated frequently lead to subconjunctival haemorrhages.
There were 102,538 records for eye injuries or foreign bodies in the eye in the VEMD database for the period 1999–06 (6.0% of the total number of records contained in the VEMD). Of these, most (97.3%, n = 99,747) were treated in the emergency department (ED) without admission to hospital.