you probably already know this but night vision should be preserved if possible, especially in a survival situation. Once lost it takes about thirty minutes to regain. Unless heavy clouds prevail, I can see well enough at night to avoid a nasty fall and injury.<br><br>Which brings up another piece of equipment we should all have in our main kits. Non tinted safety glasses. As previously mentioned I can get around pretty well with only natural night vision. But the possibility of a twig poking me in the eye is still too great. Can you imagine the trauma involved with an eye injury when you are having to be totally self reliant? I think this is a valid concern and worthy of more thought. We can not be certain that we will not have to travel at night without the luxury of artificial light.<br><br><br>Ranger.<br>The older I get, The better I was.