Boston Contact Lenses

The Boston web site states that their Boston 7 lens "utilizes
innovative technological innovations in basic polymer chemistry to
achieve a lens that offers a balance between the effects of low and
high dk materials."

What are these effects that their lens balances?

"Bob Simon" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> The Boston web site states that their Boston 7 lens "utilizes
> innovative technological innovations in basic polymer chemistry to
> achieve a lens that offers a balance between the effects of low and
> high dk materials."
>
> What are these effects that their lens balances?

The higher the dk, the higher the oxygen permeability of the lenses. So, one
would think that higher dk = better. So, I'm not sure why they advertise
"offers a balance between low and high dk".