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According to conventional wisdom, the appearance of Jacqueline Bisset in the 1977 movie "The Deep" (above) was a key factor in boosting the popularity and hence the early sales of diving masks with clear silicone skirts. She allegedly used this kind of eyewear in the film because the extra light admitted made her facial expressions more visible and photogenic for the cinema-goer and not because it provided her with superior underwater vision or protection against allergies. Fashion and aesthetics sometimes outweigh science and technology when it comes to diving equipment as well as everyday clothing.
For what it's worth, I once purchased a clear silicone mask because my preferred choice of a traditional oval rubber-skirted mask was unavailable at the La Jolla store where I obtained snorkelling gear on a trip to southern California. The feel and glare of the mask spoiled my snorkelling experience at the Cove and I have never snorkelled with any kind of silicone-skirted mask since.