Views: 11 Author: Site Editor Publish Time: 2021-11-09 Origin: Site
We all know that people cannot read in direct sunlight, because too strong light will hurt our eyes.
When people read and study under the lamp, they also need to choose the right lamp.
Post-00s and post-10s can be described as the darlings of the times. The development of network technology allows them to live in the world of electronic products since they were born, but the problems of myopia that followed have become more and more serious.
The difference between eye protection lamp and ordinary table lamp
When an ordinary desk lamp is working normally, it will flicker about 100 times per second. Such a high flicker frequency is invisible to the human eye. But the result of this is a long time under the lamp, coupled with careless eye hygiene, it is extremely easy to lead to myopia.
Most of the eye protection lamps increase the electrical frequency to 40,000 to 55,000 Hz, and the resulting flicker frequency per second will be greatly reduced, and some can even be reduced to zero, thereby protecting the eyesight. Let's talk about it in detail from three aspects: light source, color temperature, color rendering index.
01, color rendering index
The color rendering index is simply the light source's ability to restore colors. The value range is 0-100Ra. Ra is the unit symbol of the rendering index. The closer the color rendering index is to 100, the better the color reproduction and the better the quality of the light source. my country's "Architectural Lighting Design Standard" and "Desk Lamp Certification Code" both clearly require that the color rendering index should not be lower than 80.
Children's school supplies and textbooks are rich in colors. If the color rendering index of the lighting used for learning is low, it will cause color distortion, which will cause eyesight fatigue and cause myopia. Therefore, the higher the indicator of the eye protection lamp that accompanies the child to study and study, the better.
02, color temperature
Color temperature is a measure of the light color of a light source, and the unit is K (Kelvin). In physics, color temperature refers to heating a standard black body. When the temperature rises to a certain level, the color starts to change from deep red to light red to orange to white to blue. When the color of a certain light source is the same as that of the black body, we will change The absolute temperature of the black body at that time is called the color temperature of the light source.
Generally, the light seen by the human eye is composed of the spectrum of 7 kinds of color light. However, some of the light is bluish, and some are reddish. The color temperature is a method specifically used to measure and calculate the color components of the light. From a scientific point of view, the color temperature of the eye protection lamp should not exceed 4000K.
This is because different color temperatures give people different feelings. The color temperature of about 4000K makes people feel warm while awake. Under this color temperature, the mood of reading and learning is peaceful and efficient.
And because of the special structure of LED lights, the higher the color temperature, the greater the blue light content, and blue light is a well-known killer of the retina. Therefore, it is a node to want to protect the eye with 4000K, and it is too high to be self-defeating.
At present, At present, prevention of myopia has become an urgent issue in the country. The visual nerves of children and adolescents have not been fully developed. Looking at electronic screens for a long time will increase their eye intensity and decrease the blinking frequency, which can easily cause vision loss.
However, the current class conditions are inseparable from the Internet and the screen is also inseparable. This is one of the reasons why the myopia rate of junior high school students has increased the most.