ssget at a specific point

I am trying to use the following code to check for the presence of an entity at a specific point but the results are affected by
whether objects fall within the current pickbox.

(ssget point_test '((0 . "LINE")))
Is there a way to select at specific point, perhaps even allowing for a specific amount of tolerence?

I have also tried:
(ssget "c" point_test point_test)
when zoomed out far enough returns nearby lines as well.

Thanks
Cliff

 

HiHo;

(ssget "W" '(0 0) '(5 5)) Creates a selection set of the objects inside
the window from (0,0) to (5,5)
Replace '(0 0) '(5 5)
with '(your coord) '(your coord)
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entity at a specific point but the results are affected by