On the other hand, the UK government actually hired people who had had cataract operations, and therefore no longer had a UV-filtering lens in their eyes and co

On the other hand, the UK government actually hired people who had had cataract operations, and therefore no longer had a UV-filtering lens in their eyes and could see UV light. Their job was to watch the coastline just in case the Germans tried to signal to collaborators on land using UV light. http://www.komar.org/faq/colorado-cataract-surgery-crystalens/ultra-violet-color-glow/ http://www.komar.org/faq/colorado-cataract-surgery-crystalen...