Build-up of pressure within the eye that causes damage to the optic nerve is known as glaucoma. The pressure inside the eye rises and fluid is built-up inside the eye. The optic nerve and other parts of the eye may get damaged leading to loss of vision if the pressure is left uncontrolled. Eye injuries Myopia (nearsightedness) high blood pressure prescription drugs and other eye-related illnesses and diabetes can cause glaucoma. If you experience symptoms like vision loss redness in the eye nausea vomiting eye pain and so on you should seek immediate medical help. Your doctor may use prescription