this post was submitted on 26 Feb 2025
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In Person Activism
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The laser pen part makes me uneasy, on one hand its maximum damage for minnimum percieved violence, on the other hand you could cause permament blindness which is a hell of a thing to inflict on anyone regardless of circumstances. Its genius but also pretty brutal.
If one uses a disco laser or laser pointer in the visible wavelength range, it's hard to inflict permanent blindness with it. During the time it would take to inflict thermal damage to the retina, reflexes kick in and the person looking into a laser will close their eye and turn their head.
Occurrences of permanent blindness are rare. This study, even if a bit old (2015) introduces the topic with helpful case reports, for example:
Basically, they did the utmost stupidity: forcing oneself to stare into a laser at close range. They paid a price and damaged their vision, but didn't go blind from it.
Of course, it's a different story with cutting and engraving lasers, and lasers outside the visible wavelengths - you can stare into those without any reflexes helping avoid damage. The same article mentions another source, reporting about a guy (also military) who looked into a high-power range finder and perforated his fovea (the area where high-resolution vision occurs). It was most likely an infrared laser.
So, be careful but disco lasers won't strike a person blind.