Effective for many tasks: focusing at an intermediate distance (such as needlework) viewing close-up (such as needle tatting or taking out a splinter) and working or reading outdoors for non-glasses wearers who want a little more magnification. Also supplements the work bi-focal and tri-focal glasses are doing. People may choose to have several pairs depending on the distance with which the they want to work the task at hand. Clip is positionable. Rubber pads prevent harm to the surface of the wearer's glasses.