Description of the problem:
7-year-old children study and write homework with eye lamps have the benefit of what brand is better ah, the approximate price is how much? Thank you
Analysis:
Not so good, the publicity effect is greater than the actual effect.
Ophthalmologists remind: "light eye protection" may not be true eye protection.
The eye lamp "eye protection" effect, the Tianjin Eye Hospital Optometry Center Director Li Lihua said that the light is too bright or too dark on the eyes have damage, will lead to visual fatigue, thus deepening myopia, while the strobe light will also have a negative impact on the eyes. Eye lamps on the market now is not no strobe, just a high number of strobe, the human eye can not distinguish, so it feels the same as no strobe. Some eye lamps are too bright, but not good for the eyes. Experts recommend that consumers still choose the traditional incandescent light is better. Incandescent light is yellow light, softer, and because there is no AC interference, so the light is more stable.
The basic working principle of the eye lamp is to improve the low-frequency flash to high-frequency flash, it uses a frequency electronic ballast, speed up the flashing speed, increased to thousands of times per second flashes or even tens of thousands of times, the speed of flashing more than the speed of the human eye's neural response, so in this kind of light to study, office, a short period of time, people will feel comfortable with the eyes. But high-frequency flash is definitely not equal to no strobe, eye lamps and ordinary fluorescent lamps compared to certain benefits, but it is by no means as advertised as no strobe, it sent out the light is still discontinuous, is a bright light, long time to read in this light, eye fatigue will be the same.
The National Center for Quality Supervision and Testing of lamps and lanterns and the Fudan University Institute of Electro-Optical Research test results show that the use of high-frequency ballasts produced by the eye lamps, the depth of its flicker fluctuations in the range of 7.27% to 24.03%, compared with incandescent lamps, there is no significant difference, and the strict meaning of the no-flicker flicker depth of flicker fluctuations of less than 5%, that is to say, eye lamps do not meet the requirements of the no-flicker.
Eye protection lamps can not prevent myopia
Now some eye protection lamps can prevent myopia publicity, if there is really a clinical effect, it should also belong to the category of medical devices. For the understanding of medical devices, should be based on scientific and systematic clinical trials, and reported to the competent authorities for approval. Currently on the market eye lamps have not gone through this experiment, in this case to "prevent myopia" publicity is irresponsible.
The strobe of the light will be increased to tens of thousands of times per second, the lamp in the light at the same time, high-frequency electronic ballasts are likely to produce electromagnetic radiation due to high-frequency oscillation, and the current market sales of eye lamps are generally desk lamps, the use of the human body from the proximity of the human body, so electromagnetic radiation may have an impact on the human brain. On the issue of electromagnetic radiation, the state has a mandatory standard in this regard, only to achieve this standard can be considered qualified, is basically harmless, but many eye lamps on the market can not meet the standard.
The National Electric Lighting Quality Supervision and Inspection Center of Beijing eye lamp market has conducted a special sampling, sampling results show that: 80% of the products on the market are used in low-quality raw materials, such as unqualified components, parts and components; circuit design is not in line with the specifications; curing agent, flame retardant is not enough, heat and fire resistance is not qualified; poor shading, the lamp power is not enough, the flicker index exceeds the standard, and so on. Poor quality eye lamps on children and teenagers eyesight caused by the serious harm although not in the short term can be seen, but its human safety hazards and the impact of regular products is obvious.
Even if you want to buy eye lamps, do not blindly trust the publicity of the merchants, to choose the regular manufacturers of products, and to see if there is a 3C logo, this is the country on the safety of such products in the mandatory certification of the logo. When using, not too close to the human body. At the same time minimize the use of eye protection lamp time, to prevent eye discomfort caused by excessive vision fatigue. The light should be moderate, do not use excessive power lamps, because the light is too harsh will also hurt the eyes.