These glasses allow you to adjust each lens so that you can improve your vision for some of the activities you do everyday. If you have different magnification needs for each eye need to change reading glasses because of lighting conditions or you are tired of buying readers as your magnification needs change Adlens Adjustables glasses are for you. Heres how they work. All you have to do is turn a little knob on the frame above each lens. Each variable focus lens allows the user to manually adjust to his or her needs for clarity. Each variable focus lens comprises an elastic membrane held in a chamber between rigid front and back polycarbonate plates. When fluid is injected into the chamber the elastic membrane bows outwards or inwards to change the power of the lens. They are easily adjusted for a wide range of spherical powers from - 6.0 to Plus 3.0 - Incredible.Features. Type - Adjustable Eyewear. Frame Color - Crystal. Clear Lens. Adjustable glasses comprising 2 movable parts per lens. The power of each lens changes when the 2 parts move relative to one another.. Continuously adjustable magnification for near intermediate and some distance viewing.. Light weight and durable.. Dimensions - 6 x 1.5 x 2.5 in.. Item Weight - 0.2 lbs.