Well, you should know that vaporizer is a special tool to eliminate water and turn it into air. So, I don't quite understand why you insist on using it. Yes of course, it will result in a lot of symptoms such as red eyes, dry eyes and some other uncomfortable feelings. So, I suggest that you try to give it up and find some other ways safer to deal with your problem.
Yeah, your eyes may get red from the vaporizer. It is bad for your eyes. The materials from the vaporizer may let your eyes get irritation which may stimulate your eye nerves. That's the main reason for your red eyes. You'd better use it less and wear the goggles when using it.