The safety angle of the laser pointer
From a laser safety perspective, the situation has become more complicated with the development of new diode lasers that produce 670, 650, and 640 nm light. As the wavelength emitted by the diode green laser pointer becomes shorter, the output power level remains at 5 mW. This is an urgent problem: more than 7 cases of people under the age of 18 now have to endure permanent vision loss (read more about these 7 cases), all of which have only occurred in the past 4 years! The danger of laser pointers is real, and the situation has not improved.
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If we go back in time, we might see some red laser pointers used in the classroom, but these are usually safe. However, I still remember the first teacher in the classroom came up with a green laser pointer for a novel effect. Depending on the wavelength, power, exposure time, spot size and location, laser light can cause permanent damage to the eyes and retina, leading to blindness. The retina is the most risky part of the eye because the high powered laser passes through the transparent lens part of the eye and burns the nerve covering the retina. Except at night when the readability is amazing and the humidity is almost zero, if you point the environmentally friendly laser pointer at the sky, you will be able to adapt to a beam of several meters high. For you and everyone around you, it feels like the light ends on the giant star or planet you are aiming at. This makes it easier to show someone the selected celestial body.
2021-12-22 11:31:31
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