Dimmer Lenses are DebSpecs very own brand of light sensitive readers that darken when outside. They act as effective computer glasses when indoors. Our Dimmer lenses filter UV and harmful blue light from devices, overhead lights & the sun, and also have an anti reflective coating which prevents glare. Because DebSpecs has been selling reading glasses online since 1996, we know what our customers want, and we know where to source the best quality for the price! These readers are available in bifocal or full lens, and the flattering trendy style is designed to FIT your face. Texas Hold Em is for larger faces, and Black Jack is smaller. They are otherwise the same.