I recall reading many years ago (probably the Carter era) that the Soviets had such a device, and it would automatically fire a laser into the scope, binoculars or eyes. Permanently blinding any one foolish enough to even look upon them. This was back in the days of the Main Stream Media’s “We can never overcome such an advanced society, therefore we must seek peace at any price” propaganda.
This is not a new idea. I understand Casinos have been using a similar device to detect hidden cameras. I’m sure the Laser part is not far behind.
Cool! Now to figure out a way to get a lens between the thing and someone you don't like.