Costa Tuna Alley Sunglasses Green Mirror Tortoise 580P C-Mate Readers, Get the benefit of readers and sunglass all in one. Equipped with our patented C-Mate technology, these Costa Tuna Alley reader sunglasses are the perfect balance of performance and function, whether it's spotting a fish, tying a hook or reading a map. Without any visible line separating the bifocal area, these performance fishing men's Angler reader sunglasses make for a seamless day spent uncovering a new stretch of water, casting and getting one on the line. Two powers +2.50, or +2.00.