In the following cases, watching TV is the most harmful to the eyes. Watching TV for a long time has now become an essential part of many people’s lives. The result is dizziness, fatigue and weakness, known in the medical profession as “television disease”. Watching television for too long is also very bad for the eyes, someone has done experiments, a continuous 4 to 5 hours of television, vision will be temporarily reduced by 30%, after a period of time to recover. If you watch TV for a long time, your eyesight will not be restored, and long-term vision loss will be formed. In particular, watching color TV will consume a large number of retinal cylindrical cells in the retina, the vision decline more quickly. Turn off the lights to watch TV People can not leave the TV and computer every day, and the TV and computer need a high degree of concentration of the eyes, a long time, many people have different degrees of eye fatigue symptoms, especially the white-collar people who deal with computers all day, more than 90% have different degrees of eye fatigue symptoms. Some people usually like to turn off the lights next to them when watching TV or using the computer, leaving only the bright light emitted from the screen. Ophthalmologists point out that this is not right, when the contrast of light will be particularly high, the eyes are particularly easy to feel fatigue, over time, it will affect vision and even damage the eyes. Watching TV and changing channels frequently People know that watching TV for a long time will make the eyes tired and affect vision. However, according to a recent survey by researchers, compared to watching TV for a long time, frequent channel changes can do more damage to the eyes. The moment of watching TV changing channels is the most stimulating time for the eyes, because most TVs in the moment of changing channels, there will be a black screen and a sudden brightening of the situation, when the light suddenly changes, will cause a certain stimulation of the eyes, changing channels too often, more likely to lead to eye fatigue. Researchers point out that before watching television to change the channel, it is best to close your eyes, or blink more after changing the channel, because this can stimulate the secretion of eye tear glands or exercise the muscles around the eyes to avoid eye fatigue. In addition, watching TV for more than half an hour, it is best to look away and let your eyes take a break. Watch TV on the tourist car Nowadays, many tourist cars have TVs to facilitate tourists to pass the boring time during the car ride, TVs are generally installed in the front of the car, the car will play some TV programs or videos during the driving process. It is reasonable to say that this is the performance of quality service. However, when people watch TV for hours, many people will have swollen eyes, dryness, and even dizziness, nausea, vomiting and other adverse symptoms. Due to the car driving vibration and limited body space, etc., the car can only be installed 14-inch TV. But most of the coach body is long, in the car to watch TV distance and angle are not ideal. A more scientific argument that, when watching TV, the distance between the person and the TV should be 4 to 6 times the diagonal of the screen, the angle should not be less than 45 degrees on both sides of the screen. But in the tourist car, the front of the position of the passengers from the TV set is mostly only 0.5 meters, the front of the two sides of the seat passengers viewing angle is simply less than 30 degrees, sitting in the back of the passengers are too far away, basically can not see the image. In the distance and angle of improper conditions to watch TV, easy to hurt the eyes. And because the car is constantly vibrating while driving, TV images blurred, a long time, there will be eye swelling, blurred vision, and even headache, chest tightness, nausea and other discomfort, so in the tour bus should watch less TV. Watch TV on the bus Now, many cities are equipped with mobile TV equipment on the bus, in a boring ride, rich TV programs have become the only pastime for many passengers. However, most people in the bus, long time to stare at the TV screen, in fact, this is not scientific. When the human eye is looking at an object with a relatively fixed distance, the contraction and extension of the ciliary muscle can remain relatively stable, and the eye will not feel fatigued in a short time. In the bus, there are often large bumps and shakes, the TV screen will also be with the car with the trembling, in order to see the image and subtitles on the screen, the ciliary muscle will be forced to constantly adjust, easy to produce visual fatigue. In addition, due to the limited space on the bus, when there are many people on the bus, some people will stand in front of the TV, some people are far away, in order to see the image clearly, the adjustment of the eyes are often in a state of tension; there are people standing at a large angle with the screen, which is more likely to produce visual fatigue; some people just sitting under the TV, will tilt their heads to watch TV, over time, in addition to eye damage, the neck Muscles will also feel sore and tired. These improper practices, it is easy to make people dry eyes, soreness, pain and other uncomfortable symptoms, but also aggravate myopia, and even induce acute attacks of glaucoma.