Turnip knife and laser pointer danger compared to that is a small thing. The so-called laser pointer is a portable small laser transmitter, made in the shape of a pen, embedded in a solid-state laser that emits red or green light.

Chenchen (a pseudonym), who lives in Wuhan, is 8 years old. Starting a month ago, Chenchen felt that his vision seemed to have some problems, seeing things a little blurred, and there is always a fixed black spot in front of his eyes, his family guessed that Chenchen may have some myopia, so they took Chenchen to Wuhan Aier Eye Hospital Hanyang to do an eye examination. The examination found that the right eye vision 1.0, left eye vision 0.5, the left eye macular area in the center of the visible foci of the outer retina fracture, photoreceptor cells are damaged, the hospital director of fundus disease Li Xin judgment based on experience, should be burned by the bright light.






Class II laser products have an output power of 1 milliwatt. They do not burn skin and do not cause fire. Since eye reflection prevents some eye damage, these lasers are not considered hazardous optical devices.
Class IIIa laser products have an output power of 1 mW to 5 mW. They do not burn the skin. Under certain conditions, these lasers can cause blindness and other damage to the eyes.
Class IIIb laser products have an output power of 5 mW to 500 mW. At higher powers, these laser products are capable of burning the skin. These laser products are clearly defined as hazardous to the eyes, especially at higher power levels, and will cause eye damage.
Class IV laser products have an output power greater than 500 milliwatts. These laser products are definitely capable of causing eye damage. Just as they burn skin and ignite clothing, they are also capable of igniting other materials.
The International Electrotechnical Commission (IEC) classifies lasers according to their output power, from Class1, Class2, Class3 to Class4, of which, laser products for children's toys must meet the Class 1 requirements; while laser pointers, laser measuring devices, tools with laser indication and other products that can be accessed or used by ordinary consumers, their class Class 2, not higher than Class 3.