Dual lens thermal lens is absolutely essential to prevent fogging. If you're looking for replacement lenses, you probably already know all I can tell you about them. Yes, tabs are an absolute hassle to get into your glasses frame unless you are using glasses with a quick release system. I have to give credit to JT for sticking to good design and not changing it just to call it new and forcing users to replace old masks. A few months ago I put one of these lenses in my first generation Spectra mask that has been in storage for 20 years and it fits just like the original. I bought a second one last week and did the same thing for my buddy's Spectra mask from the same year. In neither case did I have any quality control issues that some reviewers complained about a few years ago. Installation Tips: First, take out the glasses frames from the mask. Frames are flexible and you want to stretch and flex them around the lens. If you do it the other way round you risk breaking the lens. A precision flathead screwdriver really helps pry the bezel around the lugs. Always start at the bridge of your nose and work your way up to your temples and then up and across. Above.
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