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.
The incidence of SCH was reported as 2.9% in a study with 8726 patients, and increase with age was observed, particularly over 50 years of age. It is thought that this significant increase depends on the increase of prevalence of systemic hypertension after the age of 50 years.