Before you get ahead of yourself and deem yourself the almighty master of night vision, there are some precautions that you should be aware of. In other words, try to avoid the following mistakes that can end up negatively affecting the goggles. For starters, they should not be turned on in broad daylight and should not be aimed directly at a bright light (even while you are in total darkness and see a light). Next, you should avoid touching the objective lens with anything but a non-abrasive soft cloth for cleaning.
Oh yeah, and also avoid disassembling the unit unless you are fully aware of what you are doing. Lastly, in order to keep it safe, you should also keep the device sealed away in a storage case when not in use.