Since we solved the problems of seeing zombies at a distance, we should probably solve the problem of seeing zombies at night. Some how zombies that come scratching at your door in the middle of the night seem a little more terrifying than zombies that arrive for high tea or supper.
There are two approaches for seeing zombies at night. One is night vision equipment and the other is a good old fashioned flashlight. I've tried a fairly rudimentary Russian night vision monocular, but frankly, I don't think it would be comfortable to use for an extended period of time.
One alternative would be a traditional flashlight like the venerable Maglite. Some police departments reported switched away from Maglites because they allegedly caused brain injuries when applied upside the head of various perpetrators. If this is true, that alone would make the full-sized Maglite a perfect choice for fighting zombies.
Finally, both night vision monoculars and Maglites would burn through batteries over time. This could cause difficulties when batteries are in short supply during a zombie apocalypse. I would suggest rigging an alarm around the perimeter of your compound. Small bells spaced at intervals on a taut string should do nicely. Alternatively, soda cans filled with a few pebbles could rattle nicely on the same line. When you hear rattles, you could illuminate the zombies briefly and dispatch them.