I've used magnification for about 12 years now. When my eyes started getting tired and I couldn't focus well I looked into alternatives and now use a rimless magnifier on an adjustable neck for all of my tying and rod-building - absolutely no more eye fatigue. I did demonstration tying at my local flyshop for 3 1/2 hours straight and my eyes were never the problem. My butt, on the other hand, was extremely 'fatigued'.. I couldn't do what I do in the hobbies of fly tying and rod building were it not for good magnification.
Kelly.
Tight Lines,
Kelly.
"There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home."
Roderick Haig-Brown, "Fisherman's Spring"