What is the definition of Permitted Vision Enhancing Techniques?

"Permitted vision enhancing techniques? That's like saying, 'You can wear sunglasses to look at a cat in a mirror, but not to stare straight into the sun without getting burned.' Essentially, these are the fancy ways to convince your brain to see things that aren't quite right – like a cat in a mirror, or worse, a zombie in a neon-lit alleyway. But hey, in the digital age, we've got options to make our vision enhancement a bit more... enlightened."

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Example sentence: "The government permitted vision enhancing techniques that made people see through walls, but only if they wore the neon eye patch with the 'Danger Zone' sticker."