80x100 Monocular Telescope
Our high-power high-definition telescopes can see ten times as far away, but how far they can see will be affected by the following three factors.
Vision
When a sighted person and a myopic person stand in the same place and look at the same location, the sighted person may be able to see more clearly and farther. For example, when looking at letters on a vision chart, the same 5-meter distance test, the sighted person can see a line farther down the line while the myopic person may only be able to see a few lines in front of them, and when the two people put on the binoculars, both of them can see the equivalent of things drawn ten times closer together, and the sighted person can still see a line farther down the line while the myopic person can still see a few lines in front of him or her.
Object Size
If there is an ant at 1000 meters and you use 10x binoculars, it is equivalent to you pulling the ant up to 100 meters to look at it, and since the ant is so small, you still can't see it even if you pull it up to 100 meters to look at it. If there is a person passing by at 1000 meters, you will see it clearly when you use 10x binoculars.
Air Quality
The same person observes a billboard while using the same binoculars. You can clearly see the small print of the billboard after rain and in sunny weather, while you may not be able to see it clearly on cloudy days with no sun and heavier air pollution. Because the air contains a lot of suspended particles, the visibility is very low.