MagEyes Magnifier

This is one of the best tool investments I've made. I needed something to reduce eye strain while tying small flies and wanted something that would work with my glasses or contacts. MagEyes are surprisingly comfortable to wear and the focal length of the lenses is just about right. They easily flip up and out of the way when not needed. Being able to change the lenses for more or less magnification makes them extremely flexible and as a result I've found them to be useful on flies of all sizes. A bit more costly than some options but well worth it in my opinion.