Perspective is one example of a monocular cue. Seeing two parallel lines that converge in the distance , at the horizon, gives people to judge approximately how far something along those lines is.
Another Monocular cue is relative size. The two boats above are different sizes. This gives the perception of depth, due to the fact that objects look further away the further they get. Painters use advantage of this to make their paintings look realistic.
I just read your article and found it very helpful to know the easy definition and working of monocular view. But what about those who are looking to buy a monocular for their hunting or whatever needs? Well, I have a better suggestion for those who are looking to buy a monocular. I'd recommend to take a look at this list of monoculars where you will find the best one for your needs.
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