Another thing that i do is use a cellphone camera. Most cell phone camera's can see IR light, the same light your G3's Eyes use or even a TV remote control. Test your cellphone's camera (many webcams, and camcorders also lack a IR filter so they can be used also) buy looking at your remote controls IR LED and hold down a button while looking at it with your cellphone's camera. If you see a red light you're good to go. Now hook up your eyes and turn on your marker and look at the eyes with your camera and see if there's a purple or red light coming from them. That'll tell you if your eyes are broke or if their just misaligned.
If you watch this video of mine you can see the purple light coming from the optical trigger switch on the G3 which is the same technology used for your eyes. http://www.youtube.com/watch?v=PZO0qhXJIrI