The rhombus-phenomenon means that the exotropia is small or absent in the original eye position and in the downward gaze, while the exotropia increases significantly in the upward gaze. This is a variation of V-exotropia. The following is an introduction to the prevention of the rhombus-phenomenon. 1, pay attention to the development of good health habits Computer operators should not eat while operating the computer, and should not eat in the operating room, otherwise it is easy to cause indigestion or gastritis. Computer keyboard contact more people, should wash their hands after work to prevent infectious diseases. 2, pay attention to keep the skin clean should often keep the face and hands of the skin clean, because the surface of the computer fluorescent screen there is a lot of static electricity, the collection of dust can be transferred to the operator’s face and hands of the exposed skin, such as not pay attention to clean, over time, easy to occur unsightly rash, pigmentation, serious cases can even cause skin lesions, affecting beauty and physical and mental health. 3, pay attention to supplemental nutrition Computer operators work too long in front of the fluorescent screen, the retina will be consumed by the retinas, and the retinas are mainly synthesized by vitamin A. Therefore, computer operators should eat more carrots, cabbage, bean sprouts, tofu, dates, oranges, as well as milk, eggs, animal liver, lean meat and other foods to replenish the whole person within the vitamin a and protein. Usually can drink more tea, because of the simple tea contains tea polyphenols and other active substances, has the role of absorption and antagonism of radioactive substances, the human body know function and genetic genes have a certain protective effect. 4, pay attention to the correct posture operation should be correct and comfortable when sitting capital. The center of the computer screen should be installed at the same level as the operator’s chest, the distance between the eyes and the screen should be 40-50 cm, it is best to use the adjustable height of the chair. In the process of operation, you should often blink or close your eyes to rest for a while, in order to regulate and improve vision and prevent vision loss. 5, pay attention to the working environment computer room light should be appropriate, not too bright or too dark, to avoid direct light on the fluorescent screen and produce interference light. Regularly remove indoor dust and microorganisms, cleaning hygiene is best to use a wet cloth or warm mop, disinfection of air filters, reasonable adjustment of airflow, change fresh air. If the computer operation at home, should also try to refer to the heart of a strip of yoyo, and the use of protective screen, in order to minimize the harm of electronic radiation body on the human body.