Please, I must have some misunderstanding ,why I see farther objects smaller although there are reflected photons??!!!
Have you read the other answers given higher up in the thread?My guess is:
Because your eyes can only absorb so many photons. The closer you are to the object the more photons from the object will hit the rods in your eyes, making the object appear bigger.
Pithy.Because they subtend a smaller angle.
While generally true (exception: lasers), this has nothing whatsoever to do with why objects further away appear smaller.Smaller angles mean less photons. It's the reason that looking at the night sky and seeing a million suns far off doesn't instantly blind and incinerate you as seeing the same million suns as close say as ours.....