So basically the further we are, the smaller an object appears and as we get closer to it, it enlarges progressively, is it so that the size of an object is always relative and that we can never measure the real size of an object. The Least Distance of Distinct Vision as far as I know is only the least distance at which the object should be positioned in front of our eye in order to be visible distinctly?

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    Nitpick: The word "relativistic" is usually reserved for talking about special relativity, which studies the effects when objects & observers move at speeds near the speed of light. I've edited your question to remove this, but please feel free to re-edit if this affects your meaning. – Michael Seifert Aug 8 '17 at 13:46
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    @MichaelSeifert Actually, that's more than a nitpick: the "relativistic" really messed this question's meaning up for me. It was very distracting. – WetSavannaAnimal aka Rod Vance Aug 8 '17 at 14:32
  • i am extremely sorry for the severe inconvenience and distraction caused to everyone due to my spelling mistake. – Ajinkya Naik Aug 8 '17 at 15:31
  • Related? physics.stackexchange.com/q/276829/104696 – Farcher Aug 8 '17 at 15:44

You're talking about how the perceived angular size of an object of fixed size changes with distance to the eye. In some sense, we never directly perceive the "real" linear size of an object with our eye; we merely know that it subtends some particular angle of our field of view, and angles are different measurements from distances.

To connect between angles and linear distances, we subconsciously use the fact that if two objects subtend the same angle in our field of view, and they are the same distance from our eye, then they have the same linear size. This is what allows us to hold a ruler next to a piece of string and say that it's 20 centimeters long.

Well distance is understood as relative potential energies, and not what you described, which have their own limits and do not provide the true size of an object

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