Maybe you are referring to 1.74 Index.. Never seen before 1.80 though.
Normally you would know your lenses are very costly. Therefore what kind of frames you go for?
People always tell me not to get a cheap frame if i have going for a good lenses...
I have had titanium frames and acetate frames.
Currently I'm on a titanium frame, but recently bought an acetate frame.
I'm now fatter than I used to be, so I have been opting for wider and deeper rectangular frames. The disadvantage here is of course with how the lenses are cut. With wide frames, you get more of the thickness at the edges.
My frames are usually about $200 and above. I look at the construction and the design. I've been to those ownday shops and their frames look very scary. I don't look specifically at the price of frames. I will pick what I like, then decide based on price between those I like.. When you've been wearing specs since K2, you know you can't take them off.
Why are you interested in the frames I buy?
There are 1.8s, I think the highest is 1.9.