The bottom third has the highest strength (and the power you choose) for reading, the middle third has a slightly reduced magnification for computer use, and the top third has about half the strength of the bottom, for clarity when interacting with someone nearby (sitting across a desk, for example). Foster Grant® Multi Focus™ technology gives wearers three magnification strengths in one, enabling clearer vision at three different distances..
Foster Grant® Multi Focus™ technology gives wearers three magnification strengths in one, enabling clearer vision at three different distances.50 Men's Rectangle Reading Glasses in Gunmetal by Foster Grant - Sawyer - +3.
50 The Sawyer is a pair of men's reading glasses with a rectangular full frame and advanced Multi Focus™ lenses. The bottom third has the highest strength (and the power you choose) for reading, the middle third has a slightly reduced magnification for computer use, and the top third has about half the strength of the bottom, for clarity when interacting with someone nearby (sitting across a desk, for example)..