bifocal reading glasses men blue light blocking computer glasses titanium alloy legs reader black 2.5x mmoww <p><b>once you do, you will love them.convenience. no put on and take off 100 time every days</b></p> <p>there is an enlarged area at the bottom of the dual focus, and the degree above is zero. so you can wear it to observe a short distance, and you can s a long distance without taking off your glasses. if you are tired of put on and take off your glasses frequently, bifocal glasses are a good choice.</p>