Ordinary soft contact lenses have almost no power underwater due to the fact that their refractive index is close to water. The net power underwater that you need is about +45 to +60D. However, to my knowledge bausch & lomb soft scleral contacts have a +200D power outside of the water, which drops to +45D or +60D in the water.
An almost identical discussion thread as this one passed along mark barville's 'freedivelist' e-mail list back in September 1998, during the early days of the fluid goggles (which, at the time, we called 'saline goggles'). I was repeatedly flamed on the list for 'stupid and irrelevant ideas' which had 'nothing to do with diving.' People thought that the fluid goggles were a 'joke' which 'couldn't possibly work.' Even famous trainer Rudi Castineyra (trainer of Yasemin & Tanya), didn't believe that the goggles would work until I sent him a prototype!
Eric Fattah
BC, Canada
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