Getting up close and personal when you need to get in and see it. These are a play on the classic graphic designer's friend, the single magnifier she or he slides over a contact sheet, film frame, or slide, and voila, it's visible and clear. Add the lighting component and we are talking about a tremendous added convenience. not just for professional use, magnifying lamps are great for hobby work (needlepoint, stamp collecting, vintage collecting), and even reading at home.
For anyone who works in a field where fine details matter, these magnifying lamps are a lifesaver. Having worked on magazines, these allowed our creative team to easily evaluate slides and photographic prints. And I can imagine a million other uses.