lemmefixdat4u@lemmy.worldtoNo Stupid Questions@lemmy.ca•Is a sound level of 105 decibels for a few seconds enough to rupture a person's eardrum?
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2 months agoPolice and emergency responder sirens are about 120 dB at 1 meter. The duration of exposure is similar to an Amber Alert tone. I don’t see people suing cities for ruptured eardrums from exposure to sirens.
Long-term exposure over 85 db can cause hearing loss, but rupturing an eardrum takes a lot higher intensity - 165+ dB. That’s a shot from a large caliber weapon from a few feet away. I know it can rupture an eardrum because it ruptured mine (shooting partner emptied his 50 cal Desert Eagle next to me before I got my protection on).
A pair of off-the-shelf reading glasses will make everything other than what’s right in front of your face blurry. But please don’t use them to blur distant things you actually will be looking at for long stretches. Your eyes will still try to focus on those blurry distant objects, and that will cause ocular muscle strain. If you did it for a few years, you could cause permanent changes to the shape of your eyeball. Then you will really need glasses.