Our Number Cruncher readers have been known to make wearers instantly better at calculating tips. This classic rectangle is an ideal choice for our wide-headed friends who want a pair of glasses good for all occasions. Trust us, we did the math. Number Cruncher comes in a wide fit and is available in diopters ranging from 0.00 to +4.00. You can get traditional full-lens readers or progressive readers, which let you see at all distances. • Material: Acetate • Shape: Rectangle