
As you can see in the picture below, Carradine has caucasian eyes like any other Irishman:

As most of you should know, Carradine played half-asian Shaolin monk Kwai Chang Caine. Having done a bit of character makeup myself, I know the limited techniques to simulate (badly) asian eyes for white actors. Some straight makeup techniques look ridiculous, like the old "Charlie Chan" movies. More advanced techniques look better, like Joel Grey playing "Chuin" in Remo Williams, but still looks fake.
The DVD versions of Kung Fu are so crisp, the fake bald caps stand out glaringly. However, I've even zoomed in on Carradine's eyes, and I can't figure out what they did! I can only conclude its straight makeup, but I can't for the life of me see it even zoomed in. And there were plenty of close-ups of Caine's eyes throughout the series.
Fake eyelids (Like Chuin) would stand out like the baldcaps. His eyes aren't being "stretched" (Like Charlie Chan, which basically requires tape to the temples stretched to hooks and rubber bands behind the head) because you can easily see that as well.
It has to be JUST straight makeup: and eyebrow pencil. But the makeup artist (Michael Westmore) must have been Picasso, because I can't see a damned line out of place!