This light-weight magnifying hood allows you to use both eyes at once for three-dimensional close-up viewing. Even fits over eyeglasses. The headset pivots up when not in use but remains instantly accessible. Use the main lens for 2.2x magnification - quickly and easily lower the second lens to switch to 3.3x magnification. The hood keeps light away from the inside of the glasses and reduces glare. I first bought one so I could see what I was doing while saw sharpening but I find I use it all the time now. This is the perfect answer for any type of close-up and intricate work because it leaves your hands free to work.