Harbor Sun Reading Sunglasses Bifocalhas been a signature style of tastemakers across the decades. Contemporary colorways bring new spin to the style without sacrificing its classic appeal. Tortoise: No Correction Polarized lenses feature an amber gradient lens and Corrective (Reading, Bifocal, Progressive) lenses feature a solid amber lens. Black: No Correction Polarized lenses feature a green gradient lens and Corrective (Reading, Bifocal) lenses feature a solid green lens. Warm Gray: