Thanks to Brian M. for sharing this with us.
For those who shoot competitive matches, you are sure to recognize the famous C-More sight. Here is an interview with the inventor of the C-More on the Practical Shooting YouTube page.
Ira Kay was a dentist back in the 90s due to degrading eye sight he tried using reflex sights for USPSA. However they would break constantly. Like many innovators, he decided he could make something better. He made his protoypes out of dental materials. The interview explains some of the issues they saw in other sights and what features they went with to solve those problems.