Actual transmission depends on lens thickness and lens power as well as
the transmission of the material.  Most materials on the market today
have sufficient oxygen for most users.

As far as transmission goes, enough is enough and more may not be
better.  Some eyes require more oxygen than others and overnight wear
demands more.  The choice of lens brand is based more on how well a
lens fits a particular eye and how compatable the lens material is with
that eye's tears than on O2 transmission.

The source of stinging  is more likely related to care solutions, edge
design or fit than to material, though a percentage of people tend to
deposit silcone hydrogels.  Rely on your fitter to quide you through
the maze of lens choice.

See below for an older article that discusses lens material

http://www.clspectrum.com/article.aspx?article=12205

See

Judy