The rectangular shaped lens of our Stretch View magnifying lamps stretches the 5-inch circular viewing area of a typical magnifying lamp to 6.75 x 4.25. This wider viewing area allows for comfortable vision with both eyes and reduces eyestrain and fatigue while increasing visual scanning speed because more surface area is magnified. To improve its vision enhancement characteristics further, these magnifiers use a powerful 18-watt compact fluorescent light (included) to produce 130 footcandles at 15-inches above the work surface. Exact positioning of the light source behind the lens allows for a choice between even, shadow-free illumination or a hi-lighting effect.