Does camera flash affect cats?

I just took a picture of myself with flash by accident, and my cat was sleeping next to me. It wasn't a direct flash, but it was close to him. I have a small nikon camera, the flash is not so strong. I waved my finger in front of him, he seemed to follow it with his eyes/head. Will he be fine? I'm really worried, do cats go blind easily? Am I worrying too much? It wasn't a direct flash, just a side flash. It didn't scare him too much. BTW, he's 2 years old.

He probably thought you had invented indoor lightning. Yes, you worry too much.

He should be fine, you just gave him a bit of a shock, How would you like it if somebody set a camera flash off infront of you when you were asleep?

Don't worry about it, your cat will be fine, I have the flash on all the time with the cats around.