New Technology for Iron Sights

Called the MicroSight, this is a brilliant idea for shooters who want to keep using iron sights but are limited by deteriorating vision. While it looks like this concept would work great in competitive shooting (assuming the rules allow for it) and in an arid environment when hunting or in combat, I wonder how well it would function in the snow and rain. Would snow, rain or fog haze up the image to the point where you couldn't see the target?

Regardless, I want to give it a try. It would be fantastic if it worked for pistol shooting as well. I would love to incorporate this into one of my bullseye guns.

--John B. Snow