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You can only perceive what is in your field of view,look at an object with one eye shut,then do the same with the other and the object seems to be in a different place,open both eyes and the object shifts again. every persons interpretation of where the object is will be different due the way their own eyes receive the information,you can do all the tests you want including exact measurement but that also requires individual interpretation.You could even go out of view of said object while a friend stands in front of it and explains its distance to him and how they perceive it.Of course the only thing you will perceive is your friend telling you this,your friend and the way you interpret him is also unique only to you.No perceivable information of the object can pass from it to you friend then on to you,the only thing you will interpret is your friend.So one might say you reading this can some how perceive me and the other person in front of a tree discussing this,well you cant as no interpretable information can pass between fist object,my friend,me then your computer.The only thing you reading this can interpret is the text on the screen on your computer which in turn is also has to be in your personal field of view to interpret.