![]() In the past, CRT monitors were the only type of monitor available. Is There Anything I Can Do to Prevent my Eye from Automatically Reverting Back to My Old Monitor? ![]() But they show that there is some level of danger in using CRT monitors for long periods of time. ![]() The studies were done in the 90s so they are not as reliable as modern ones would be. Another study found that people who use CRT monitors for more than six hours a day are at an increased risk of developing brain cancer. One study found that people who work on CRT monitors for more than two hours a day have a higher risk of developing cataracts. However, it is not clear if this radiation is actually harmful and how much of it a person can tolerate. What are the Dangers of a CRT Monitor in the Long Run?ĬRT monitors, like other monitors, emit radiation that can be potentially harmful to the eyes. The flickering does not affect you if you have a healthy eye and it is not a problem for people who do long hours of computer work. They think that the flickering of the screen and the way it displays colors is harmful to your eyes.īut in reality, CRT monitors are not worse for your eyes than other monitors. Some people believe that CRT monitors specifically are bad for your eyes. CRTs are typically heavy because they contain many components inside them, such as leaded glass, a mercury-containing fluorescent lamp, and phosphors on its faceplate. The size of CRT monitors varies from 17 inches to 27 inches and it can be either analog or digital. The light is then projected onto a viewing surface, or screen, which can be seen by viewers. The CRT is a vacuum tube that has three electron guns that shoot electrons onto the back of a fluorescent screen, which then emits light when struck by an electron beam. They were first introduced to the market in 1968 and have been used ever since.Ī CRT monitor is composed of a cathode ray tube (CRT) and a glass screen. However, such tubes must not be used with too high a voltage because if they are the electrons on impact with the glass / fluorescent screen would produce a potential health hazard - X-rays.CRTs are the most commonly used type of monitor in the world. Modern cathode ray tubes use a hot cathode source whereas the older types use a cold cathode which generally require higher voltages to operate. So there is a compromise between the values of voltage and pressure. Having a high voltage across the tube means that an electron can gain more kinetic energy between collisions with the air molecules and thus a smaller distance between gas molecules (not quite so low a pressure) can be used. This means that the gas pressure must not to be too low thus decreasing the distance the electrons travel between collisions with the gas molecules. On the other hand if there are too few gas molecules the intensity of the emitted would be too small to observe the emitted light. So a low pressure ensures that the distance between collision is sufficiently large to enable the electron to cause excitation/ionisation of the gas molecules. If the cathode ray experiment uses a discharge tube which emits light then the electrons must be accelerated enough (obtain enough kinetic energy) between collision with the gas molecules in the tube to excite/ionise the gas molecules on collision with them. You need a reasonably high accelerating voltage to give the electronsĮnough kinetic energy to make the fluorescent screen glow when the electrons hit the screen.Of electrons is not impeded very much by collision with air molecules. You need the low pressure in the tube so that the passage of the beam.If the cathode ray experiment has a beam of electrons hitting a fluorescent screen which glows then:
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