How to choose a safe monitor

   Everyone knows that the computer has become a major centre of daily life for most people. Both parents and children spend a lot of time in front of the computer. Therefore, it is very important to choose the least harmful monitor.

   It’s not too difficult to select a functional and relatively safe monitor today. One should only know the basic types of monitors and basic requirements they must meet.

Types of monitors.

1. Cathode-ray tube (CRT) monitors. The image on the screen is created by a beam of electrons emitted by an electron gun. This electron beam is accelerated by high voltage (tens of kilovolts) and falls on the inner face of the screen coated in luminophore (a substance that glows under the influence of the electron beam).This type of monitor is a source of electromagnetic radiation and X-ray, which adversely affect the human body. These monitors are no longer used because of their harmful nature, and LCD monitors are coming to replace them.

2. Liquid crystal displays (LCDs) are made of a substance that is a liquid, but has some properties unique to crystalline bodies. In fact, those are fluids who have anisotropic properties (including optical) related to ordering the orientation of the molecules. The molecules of liquid crystals can change their orientation under the influence of voltage and consequently change the properties of a light beam passing through them. Due to these physical properties, LCD monitors are safer because they do not require the use of high tension.

3. Touchscreen. This is essentially the same LCD display and they affect the body in the same way. The difference is that communication with the computer is effectuated by touching a finger to a particular place on the sensitive screen. This type of monitor is becoming increasingly common. Most often they are used in tablets, smart phones and other gadgets.

   Which are the characteristics of the monitor to pay attention to?

   To prevent eye fatigue, the image should be bright, rich in contrast and distinct, the screen should not flicker, and fine details of a document should be easily readable.The first thing to pay attention to is the screen diagonal. In this respect, the monitors vary largely: from 9” to 46”. The choice is yours to make. Monitors with a diagonal of 17”-20” are considered normal for everyday work. But remember that the most important thing is the maximum screen resolution. On it depends the clarity of the image. Contrast is no less important when choosing a monitor. It is the ratio of maximum brightness (when displaying white) to the minimum (when displaying black). For LCD monitors the normal contrast is 250:1 or 600:1. If it’s more than 1000:1, it is also very good.

   Brightness. The higher it is, the more comfortable it is to work with the monitor under intense illumination. The norm for LCD monitors is 250-300 cd. Brightness and contrast can also be improved by using anti-reflective coating which can scatter incident light without letting it bounce off the screen.

   Viewing angle. In modern monitors this indicator should reach about 175.

   Should we be afraid of electromagnetic radiation? The radiation of modern monitors is not as significant as we think. Electromagnetic fields are a natural part of the environment. Man as a natural body was formed under the conditions of constant exposure. Of course, with the development of information technology and programming, this impact has become much greater. Much more powerful sources of electromagnetic waves appear more and more often, but modern society simply cannot do without them.

   Remember also that the farther your monitor is, the better. Ideally this distance is about one meter. Of course, this distance is rarely possible to achieve, but nonetheless you can sit not too close to the monitor.

   However safe the monitor you purchased, always mind your eyes. They take over the entire load, are always focused and work without rest, but anyway, we forget about them. Be sure to take breaks and exercises for the eyes. Also, people who spend much time at the computer should take eye vitamins or eat more carrots or blueberries.

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