Sunglasses that train your brain by dimming when you daydream

Right - this device seems to be for the kind of person who only measures "productivity" and "being engaged with something" by direct and tangible, immediate results. I read five pages - I was productive. I wrote two pages - I was productive.

Lord knows how many times I've been able to refine my thinking and model of something by just casually letting my mind wander and quasi-daydreaming about it.

I disagree. I think the idea is not to eliminate daydreaming, but to remedy those who do it excessively (I have been one of these when I was younger). Once you've got the problem under control, you should discontinue use.

As for your second point, sometimes it is the brain's fault. It may not be severe enough to be a disorder, but individuals differ in their ability to concentrate.

But I understand what you mean -- there are a lot of distraction creators in the modern world (smartphones being on top, IMO). Using a device without addressing those is not the best way to go.

This is just neurofeedback which many people believe is an effective treatment for ADHD. Day dreaming in and of itself is not bad, but constantly being distracted from tasks is. Some people are incapable of reading more than a page of text without losing concentration.

Neurofeedback is useful for training yourself to produce different mental states on command, so you can focus when you want to focus.

Of course they can, Zaphod.

Dimming the glasses while in danger doesn't seem like a sensible thing to do.

It's probably not easy to get electroshock devices approved for sale. Also, is "punishing" what they are going for? It seems like it's biofeedback, which isn't the same, it stimulates awareness.

Instead of shocking people, why not dim some lenses in front of their eyes?

Like pavlok.com?