In this video the Youtuber is talking abou his Revisiion Military Eyewear that would've protected his eyes from ricochet that flew from one of his students firearms. He shows the pair of sunglasses he was wearing when the incident took place and how it damaged his glasses. For firearm training instructors it's necessary to wear the proper gear to keep your eyes safe.
He reiterates that people will spend a lot of money on guns, ammo, and clothing but spend a few dollars on eye protective wear. He's suggesting that people begin to take their eyewear seriously when doing any type of firearm shooting or training. Having on sunglasses that are high rated for ballistics will protect your eyes from accidental ricochet.
Revision Eyewear offers people with protective sunglasses that are made to withstand ricochet that other more mainstream sunglasses such as Oakley's doesn't offer.
read more about tactical sunglasses including why you should wear them at Apache military sunglasses.