A contrast

Examining contrast can be interesting. Not long ago I received my new pair of reading glasses from Kaiser optometry and paid $99.00 for the new lenses. Today I tried on and bought a pair of reading glasses at the 99 Cent Store. The $.99 glasses are well built and the surprise is that they are more suitable than the pair for $99.00. I have no idea how the 99 Cent Store can sell products for less than one dollar and still maintain quality.