There’s a survey showed the world’s primary visual adverse detection rate of 60.2%, 81.89% for high school and junior high school students 71.89% 43.5% primary and secondary school students.
Whether there is direct contact between the lighting and juvenile myopia? What is the scientific and health of lighting?
The human eye requires a “light healthy”
Light healthy emphasis on a more scientific method of lighting. In addition to the functional requirements to meet the most basic lighting, but also consider the requirements of physical and mental health, such as UV protection, glare, LED home lighting fixtures avoid these damage. “Zhen Hospital, Beijing Ophthalmology Wang Jun, director of the” scientific “.
“From a physiological point of view, the human eye is like a sophisticated ‘optical instruments’ can feel the brightness range is very wide, identifiable from a few thousandths of nits until the object of millions of nits.” He said.
Daytime, when the ambient brightness of 10 000 nits brightness range, the human eye can distinguish between about 200 to 20 000 Bennett, less than 200 nits of brightness will be perceived as black; nighttime environment for 30 nits can be distinguish the brightness range of 1 to 200 nits, then 100 nits of brightness caused by a very bright feel, only less than one-nits brightness was caused by black feeling.
The visual perception of the people need to rely on the regulatory role of the pupil and the light-sensitive cells. Pupil to adjust its size according to the strength of the external light, the light-sensitive cells into cone cells and rod cells, the sensitivity of the latter is one of the former times. High and low, the pupil and the light-sensitive cells regulate each other, the luminous flux impinging on the retina remains moderate. Therefore, you do not use LED home lighting fixtures, the light is too strong or too weak will have an adverse effect to the eyes, and led streetlight is good.
Daily lighting shall comply with the law of the human visual and eye health, lighting without reducing the quality of the case, use less energy, ‘green lighting’ LED home lighting fixtures This is the lighting of the scientific, health, the Chinese construction Academy of Sciences building optical Research surnamed Zhang, experts said.
Daily in the “light hidden
“Healthy lighting emphasizes the brightness of the light spectrum. From the functional conditions, when the light is too dark, people will instinctively close to the visual target, a long time, will naturally make eye refractive changes, resulting in myopia.” Wang Jun said.
However, the light is too strong will on vision damage. Daily life, read and write only 100 lux. Reading in the sun, the illumination of up to 80,000 to 120,000 m candlelight is 800 to 1000 times of the day-to-day illumination.
Long to read in bright light, the eye muscle over-regulation, will lead to the occurrence and development of myopia, the light on the retina, in particular, cause damage to the macular region, decreased visual acuity, and even cause permanent vision loss, you need to do is to replace ordinary lamps, LED home lighting fixtures.
Stroboscopic light for a long time to read, also make the pupil sphincter and retina due to the excessive use of fatigue, pain and even damage to the optic nerve, resulting in dizziness, headache, upset and nervous, even tachycardia.
Of AC mains waveform per second up and down 50 times (ie, 50 Hz frequency). Fluorescent tubes with 50 Hz mains, per second, there will be 100 times a bright and a dark flashes. The strength of the AC frequency caused by the bright and dark “strobe” For a long time in this light environment of the human eye will produce a lot of damage.
If you use a computer in the light flashing usually inductance ballast fluorescent lights flicker and the screen frame pieces overlap to form a light resonance greater harm to the human visual system. Therefore, the European Electrotechnical Commission in 1997 to prohibit the Office of the computer screen to install the use of inductive ballast fluorescent.
The spectrum of the lighting will have an impact on vision. The spectrum of the sun for 100Ra, the object can show the true color of sunlight exposure. Architectural lighting design standards requirements in the living room and office space, the light spectrum of 80Ra. Even so, under the irradiation of the electric light, the color will continue to have varying degrees of distortion.
“From a technical perspective, the lighting spectrum with the spectrum of the sun the more similar the better, such as LED home lighting fixtures. But a single light source is difficult to have this spectral range. Incandescent light source and the spectral composition of the sun is not uniform. Therefore, the human eye for a long time exposure in this environment is unhealthy, the light source LED home lighting fixtures is no doubt that is closest to the solar spectrum. “white Ting-chu, a professor of Beijing Institute of Technology College of Photonics.
At the same time, the interior lighting must be avoided to reduce glare and interference. If the brightness of the lamps, window or other regions brightness than ordinary indoor environment is much higher, people will feel the glare cause eye pain, tearing, decreased visual acuity. In the classroom need to install curtains, to prepare for when the sun is high, to avoid the production of glare.
“Home” lighting hidden
The lighting conditions are not standard would adversely affect the vision, however, the popularity of digital life is so many people to daily exposure to unhealthy lighting environment.
“Now most of the classrooms are used fluorescent lamps, or a good light. Have not been able to replace the present situation, it is more reasonable, more economical light source.” Surnamed Zhang, the researchers said.
He believes that a reasonable run out, is very important to develop good study habits. Keep up with the 1960s and 1970s compared to today’s students in the room “home” time longer than before, a lot of leisure time to do a lot with the eyes, the lack of outdoor activities, this is where the problem lies.
The root causes of young people nearsighted lies not in the light of the conditions fail, but should be freed from the pressure of learning as well as high-intensity environment with the eyes. “White Ting-chu said.
The light is also an electromagnetic wave, both the volatility of another particle. Particles penetrating through the body when it will produce damage to human tissue. Lighting light penetrating very weak, in a short period of time, the human eye may feel less than a light stimulus, but there are hazards for a long time. Therefore, do not house at home and fast to use LED home lighting fixtures, do not kill your eyes.