I found reading glasses in the dollar bin at Target a while back, so I bought 4 pairs in different strengths. Tried each one out at my LA, and found the perfect pair! Did the same with my sewing machine and computer, then found the 4th pair worked perfectly when I draw. Four pairs of glasses for $4, each one in use! I wrote down what strength I use for each, so when these wear out I can find them again.