The age old battle between readers and reading glasses is indeed one of personal preference. That's why we've made it easy for you to know how to choose which is best for you with the Readers + Silver Universal Pod Case. Thin, lightweight, and durable Readers made from optical grade polycarbonate plastic. Available in a variety of magnification strengths (+1.0, +1.5, +2.0, and +2.5 diopters) and frame colors (Black, Blue, Red, Purple, Brown or Clear). Attaches (via an included non-residue adhesive strip) to nearly any hard and flat surface, including the back of your smart phone or laptop. Just as easily, slip these reading glasses + case into your wallet, purse or pocket, to ensure that clear vision is Always With You!