I have since tens of years a credit-card-Lupe in my purse. If I have to read the table of contents or otherwise lower case in a business that is easy with a magnifying glass. Now I have bought for my mother, the Fresnel magnifying glass, which she also used to read in a café newspaper. Now want girlfriends of her as a magnifying glass. The credit card with weighs next to nothing, is easy to put in your wallet, thus easy to find and quickly at hand. And you can easily read the "small-written".
