Eye strain and headaches are considered to be related to refractive error. If the patient is also suffering from eye swelling and loss of vision, he/she needs to visit a hospital to have his/her visual function checked. In addition, if the patient is under mental or psychological stress, has little sleep, is overly tired or has insomnia, it can also cause eyestrain headaches. It is advisable to avoid prolonged eye use in daily life, to do eye exercises and to seek medical attention promptly when symptoms of discomfort arise.