Use the laser pointer carefully

Laser is a kind of high-purity, highly concentrated light energy. When the high powered laser is irradiated to the eyes, it will appear black through the retinal pigment epithelium. When the laser is turned on, it will instantly absorb the light energy and produce a thermal effect. The macular area will cause damage to the macular cone, and severely burn the macula. The photoreceptor cells are burned after death, which is equivalent to the damage of the camera’s negative film. The lens is defective (cornea) and can be replaced. However, the film is broken. According to current science and technology, it is impossible to repair." Wu reminded the public: Do not use The 2000mW blue laser pointer is used as a toy purchased by children. I almost enjoyed the exotic atmosphere and bought the blue laser pointer on the Internet for several years. In the first few decades, there were only red laser pointers. Later, you can occasionally buy green laser pointers, but for a long time blue laser pointers. Color laser pointers are still too expensive and almost infeasible in the country. At the same time, this has undergone a fundamental change, and you can spend very little money to put your presentation in the blue place. Compared with the country/region Like all approved pointers, the usable power is less than 1 milliwatt, which is usually enough to be used as a luminous pointer or for adjustment and measurement. However, for the blue version, depending on the quality of the device, you should pay attention to whether you can clearly see the wall during the day The point of light on the surface. The reason lies in the nature of the human eye.