| It's difficult to see in the dark. Unless | | | | |
| there's some light peeking in through the | | | | Atmospheric conditions can affect night |
| window or from under a door, our vision is | | | | vision. For instance, if it's cloudy, foggy, |
| compromised. If we wait a little while, our | | | | or overcast, night vision can be compromised. |
| night vision kicks in, allowing us to see | | | | The clearer the night, the farther one will |
| somewhat better. It's not enough that we can | | | | be able to see with night vision technology. |
| read in the dark, but it should be enough to | | | | It should also be noted that night vision |
| keep us from stumbling into furniture or | | | | shouldn't be magnified, as light is lost |
| tripping over the carpet. Sometimes though, | | | | during the magnification process making it |
| our human night vision isn't enough and we | | | | more difficult to see. |
| need a little help. | | | | |
| | | | Night vision devices include: |
| That's where technology kicks in. Thanks to | | | | |
| science we can use night vision to do all | | | | - Cameras |
| sorts of things. With the proper equipment we | | | | |
| can hunt, take pictures or even fight wars in | | | | - Binoculars |
| the dark. We can also perform surveillance | | | | |
| and search and rescue missions. | | | | - Scopes for firearms |
| | | | |
| Here's how it works: Your night vision | | | | - Goggles |
| product will take existing light and amplify | | | | |
| it through an objective lens, which then | | | | If you think that using a night vision device |
| focuses on an image intensifier. A | | | | on a frequent basis might be harmful, you |
| photocathode located inside the intensifier | | | | couldn't be more wrong. Night vision |
| converts the photon energy into electrons. | | | | products are no more harmful than a |
| The electrons in turn strike a phosphor | | | | television or movie screen. It doesn't emit |
| screen creating a viewable image. In reality | | | | radiation or other harmful rays and there's |
| it looks like you're watching television on a | | | | no reason for it to cause blindness. |
| green screen. | | | | |