Essilor is the parent company of Crizal, they're the world's largest provider for ophthalmic lenses with a dozen brands under them
Essilor brands
Personally, I've tried several types of lenses, transitions, polycarbonate, CR-39, Owndays etc... I can related to lacquerine's experience,
as I've always found that the Owndays lenses seem to give me quicker eye-fatigue, and I've relegated them to a backup pair of spectacles.
I've owned 3 pairs of Crizals now and have no complaint whatsoever other than it's high cost, but it really warrants the quality. I have astigmatism on top of typical myopia but my $300 pair of Crizals never seem to give me any form of fatigue, worth every dollar over my $100 pair of Owndays. It may be cheap, but it might be the lens aspherical properties, material properties or various combination of factors that give my vote towards Crizal (by Essilor).