Shortsighted (6)
I believe the answer is:
myopic
'short-sighted' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for myopic that I've seen before include "lack of foresight" , "needing help from lens" , "Condition of short-sightedness" , "Nearsighted" , "Imprudent" .)