From my limited knowledge, I can't see Giverny, Arlés or the Polynesia being too polluted at the time. Nor can I explain Greco, Bosco or Arcimboldo by eye/mental ailments. Much less Gaudi, Shostakovich, Profokiev, Ezra Pound, Kafka, or works like Dr. Caligari's Cabinet or Un Chien Andalou, or the Roaring Twenties, because of smoke, mirrors, or any other simplistic reasons. To name but a few. Plus, seeing the personal evolution of the likes of Monet, Van Gogh and Mondrian, and their impact on subsequent forms of expression, I find it hard to believe pollution or eyesight had an impact beyond eliciting a reaction against it.
OTOH, I see ciaroscuro, flou, bokeh, harmonics, suggestion, soft shapes in Architecture, Music, Literature, Sculpture... having been always used but specially blooming at the turn of the 19th-20thC. The proposition somehow reminds me of 60's engineers' claiming Amerindian Arts were made by aliens because they saw a similarity with astronauts which was what they "knew" (ignoring all other evidence).
I tend to agree with the critics who say that it is an oversimplistic explanation of what were artistic choices spanning not just the painting arts.