I fancy myself a sophisticate whenever I raise my glass in a toast and know that it's proper to meet the eyes of everyone else with a glass in the air. I make it a point to look straight into their eyes with a slight nod, and a polite smile. When that ritual isn't returned by someone, I write them off (not completely) as having a lack of sophistication, they don't know better.
Guess what? While it’s nice to acknowledge someone with eye contact as you clink glasses, this practice has nothing to do with etiquette. It has everything to do with sex; not looking into someone’s eyes can gain you seven years of bad sex!
It’s up to you! Cheers!