D28 Reading Glasses in Black Tortoise is a hearty helping of precision-cut, 100% acetate with “Izquierda” and “Derecha” laser-etched across the top in case you forget which side is left and which is right. Proprietary frq™ near-clear lenses are infused with blue light blocking technology to reduce eyestrain and improve sleep. Lenses include anti-reflective, scratch-resistant coating. Premium, bio-based acetate frame with 5-barrel industrial hinges. A square frame shape ideal for heart, round, and oval faces.