And during World War II, what he would see would be pilots coming back from their missions, and he noticed that within their eyes they had shards of small bits of material lodged within the eye, but the very interesting thing about it was that material, actually, wasn't causing any inflammatory response.
Durante a Segunda Guerra Mundial, ele observou os pilotos que voltavam de suas missões e notou que em seus olhos havia pequenos fragmentos de material ali alojados, mas o interessante disto é o fato de que aquele  material não causava qualquer resposta inflamatória.