Blue visual field defects occur when the tissues in the eye that control the color blue become abnormal. Visual field defects are a common symptom of many neurological disorders, and damage to different parts of the visual pathway and different diseases can lead to different visual field defects. So, what should be done to prevent blue visual field defects? Here are a few prevention methods. 1, eye massage method middle finger pointing between the eye sockets and the bridge of the nose, palm covering the face back and forth friction for five minutes. Then neck each left and right slowly move, then close your eyes, clench your fist and tap the back of the neck ten times. Or look away for three minutes, then look at the palm of your hand for 1 to 2 minutes, then look away again. This far and near exchange several times, can effectively eliminate eye fatigue. 2, alternating hot and cold compress method a towel dip than the bath water is a little hot water, another towel dip with ice cold water, first put the hot towel on the eyes for about five minutes, then put the cold towel for five minutes. 3, eye gymnastics middle finger pointing between the eye sockets and the bridge of the nose, palms cover the face back and forth friction for five minutes. Then the neck slowly move around, then close your eyes, make a fist and tap the back of the neck ten times. 4, look far and near method Look at the far side for three minutes, then look at the palm of your hand for 1 to 2 minutes, and then look at the far side again. This far and near exchange several times, can effectively eliminate eye fatigue.