Jim wears these all day in the shop and they are moderately comfortable for 8 hours. Would be perfect for shorter stints. This imported headband magnifier set comes with 4 interchangeable plastic lenses 1.5X at 15" focal length, 2.0X 10", 2.5X 7", and 3.5X 6". Jim tends to keep the 2.5 magnification on most of the time during his gun and machining work.
These can be worn over prescription glasses or safety goggles and the visor can be tilted up or down. You will need to tighten the screws to keep it from coming loose.