Tecumseh, Fly fisherman are notoriously old and can't see. There are a lot of aids to both fly tying and tying a fly on the line that can be had at a good fly fishing store. Orvis comes to mind, but they are expensive. Bass Pro Shops has a goose neck 4x magnifier for about $20. They also have "natural light" lamps that illuminate with cool light. These are more expensive...about $80. Fly shops also have mag glasses and even little magnifying discs that stick on real glasses in power from 1.5 to 4.0.