Gittes sunglasses

[Belloqinabush]

I was rewatching Chinatown recently and took notice of JJ gittes' sunglasses. They aren't typical aviators as the lenses look to be a bit more on the rounded side. If anyone could give me any advice as to what type of glasses these are it would be much appreciated. I don't really know how to post pictures on here, so I found a couple decent links to screengrabs.
http://onethousandandonemovienights.blogspot.com/2012_03_01_archive.html

http://odeonreviewdotcom1.files.wordpress.com/2012/10/nicholson-in-chinatown1.jpg

 

[Dinerman]

Pretty common shape for the time period, wiith the rounded top and octagonal bottom. Look like they're rimless, with drilled lenses. As far as modern production goes, take a look here:
http://www.shuron.com/ronwinne.htm
http://www.shuron.com/regis2.htm
with tinted lenses

 

[Dixon Cannon]

Slightly better photo for comparison. Good luck! -dixon cannon