There may be many alternatives to the things you see here. Magnifiers - Magnifiers provide a sharp, crisp, and distinct image and vivid enhancement of surface details. Designed to provide brilliant illumination over the field of observation. High-powered magnification has universal application for precision scientific work. Illuminated magnifiers are supplied require batteries.
Costs vary widely depending on magnification.
Talking Calculators - vary from basic calculators to those that do scientific, algebraic, business and statistical functions. Browsing through text, storing and retrieving files and customizing reading parameters are all menu-controlled in a comprehensible user interface designed for simplicity and learning ease. Some cameras can be hooked to a regular television set. Remember, these are just examples. There may be many alternatives to the things you see here.