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I agree that rain on glasses at night is pretty horrible, especially in traffic or around bright lights. However, I've found that a good squirt of silicon-based furniture polish helps prevent the rain from beading on the surface of the lenses.
I've also put a wipe of clear silicon sealant along the fingers of all of my long cycling gloves, so that I can wipe the lenses - windscreen wipers effectively. That also works really well.
Alex_B-
Good tips. But in TCR you're probably not going to have that stuff to hand, when the storm kicks off. I got caught by a biblical rainstorm in Croatia in TCR 2016 and I had to take my glasses off. I could just make out the white line in the middle of the road and followed that. Would have loved contacts then, but wouldn't have been able to put them in with waterlogged hands. Best plan would be to put them in before the storm came, of course!
frank9755
I use prescription / photochromic lenses.
The challenge is getting frames that work in an aero position. I went to the opticians and tried all their frames with my head down, looking through the top of them, and found some ones that had virtually no bar visible at the top.
Only problem is when it rains really hard, esp at night, and glasses are useless. It doesn't happen often but I've thought of carrying a couple of disposable lenses to use then. Chances are I wouldn't bother faffing with them in those conditions though, just take the glasses off and hope not to hit anything big.