> This can result in double vision, chromatic anomalies, headaches, and worse. I can attest to this. My astigmatism is pretty severe, and the lenses are useles

> This can result in double vision, chromatic anomalies, headaches, and worse. I can attest to this. My astigmatism is pretty severe, and the lenses are useless if any measurements are even slightly incorrect. Usually when I get new lenses I end up sending them back at least once for one defect or another. Sometimes this is the frame tech's fault, but I've also seen quality issues from the lens factory.