Scientists believe they have discovered the secret behind the work of Claude Monet, one of the founders of Impressionist painting. The artist is known to have suffered from cataracts but new research shows how much and for how long this could have had an effect and how it may have produced his distinctive style. Researchers recreated Monet's Water-Lily Pond as he would have seen it. The pond was the subject of a series of canvases which Monet exhibited in 1900 at the age of 60.