I have strong myopia (about -6.00) and "moderate" astigmatism (sorry, I
can't remember the number). By choosing small frames and 1.7 high-index
lenses, I've been able to wear glasses that look good. Any other type
of lens, including polycarbonate, results in Coke-bottle lenses.

I'm very pleased with my current glasses... I was amazed when the
optician first presented them to me... but I'm interested in seeing
just how thin I can go.

Since getting my 1.7's, I've moved near the Canadian border, and I'm
aware that 1.8 and 1.9 high-index glass lenses are available north of
the border. I visited a well-regarded local optical shop for some minor
repairs, and I started chatting with the optician. I asked him about
the 1.8 and 1.9 lenses, and he said that at my prescription, the
difference wouldn't really be noticeable. OTOH, I realize that he has a
vested interest in getting me to buy my next pair of glasses from his
shop instead of sending me to Canada.

So I'm looking for an unbiased opinion: are 1.8 or 1.9 glass high-index
lenses worthwhile for someone around -6.00?

And if the answer is yes, does U.S. Customs give returning residents a
hard time about bringing back these lenses? I've heard of an optical
shop right by the Detroit/Windsor tunnel on the Canadian side that
caters to U.S. residents seeking thin glasses. However, I wouldn't be
surprised if many of these glasses are undeclared and smuggled into the
country by wearing them. For various reasons, I always declare
everything I'm bringing back from Canada, even a half-empty can of
Pepsi, or the cardboard box and information sheet from my Canadian flu
shot during last winter's crisis.

Thanks,

Matt