Visual field is also known as “field of vision”. When the eye is fixed on a point (or through an instrument) the range of space that can be seen, the binocular field is larger than the monocular field: the field of view for each color is smallest, green field is smallest, red field is larger, blue field is larger, and white field is largest. If the tissue controlling the blue color in the eye appears abnormal there will be color visual field defects, and blue visual field defects are also the cause of such. So, how should blue visual field defects be prevented? The following are ways to prevent blue visual field defects: 1. Blink method Tilt your head back and keep blinking to keep the blood flowing. When the eyes are slightly tired, just do 2~3 blinking exercises. 2, alternating hot and cold compress method a towel dipped in hot water than the bath water is a little hot, another towel dipped in cold water with ice, 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 exchange near and far several times, can effectively eliminate eye fatigue. Try it! 5, the computer family’s eye care tips Clinically, we often encounter such patients, their symptoms are “dry eyes, even dry, photophobia, blurred vision. Most of these patients are computer operators, copy editors, art workers, teachers and embroidery workers. With the popularity of computers in work and life, this condition is more common. Their symptoms are not caused by pathological changes, but by improper use of the eyes.