| Military night vision goggles are used usually to as | | | | You also have problems distinguishing between two |
| artificial illumination during military operations and night | | | | objects that have the same heat level (making it a |
| time combat. This adds to the safety of military | | | | problem finding out which is enemy and which is friend). |
| personnel a lot, as they can move around without | | | | In some cases, infrared night vision goggles can be |
| being detected by their illumination tools. | | | | used to see through walls. |
| The military uses two main types of night vision | | | | Because they don't need ambient light they have the |
| goggles: | | | | advantage that they will work in any condition, just by |
| Image Intensifiers | | | | using the heat of objects. |
| Image intensifiers work by magnifying existing light | | | | A Global Security survey says that these are the |
| (enemy flashlight, moonlight, starlight) so that you can | | | | downsides of all night vision goggles: |
| see like you would during the day. But, the problem is | | | | - 20/25 to 20/40 vision in the best case scenario |
| that when a very bright light source appears, your | | | | - Monocular or tunnel vision (no peripheral vision so you |
| image is overwhelmed. Their advantages are the small | | | | need to keep looking around to see potential dangers) |
| weight, the price, size and the detailed images they | | | | - At the same distance, larger objects seem to be |
| bring, while consuming little power. | | | | closer than small ones |
| Infrared Lenses | | | | - The time it takes you to readjust your eyes when |
| Infrared lenses convert the infrared spectrum into | | | | you take off the goggles. |
| visible light, but at the cost of the detail, which is low. | | | | |