The Cambridge English Dictionary defines far-sighted as
having good judgment about what will be needed in the future
and making wise decisions based on this:
Buying those shares was a very far-sighted move –
they must be worth ten times their original value now.
They label this a “UK” definition, but I disagree.
I’m a US person, and I believe that this meaning
would be well understood here.
Note that these definitions of farsighted
(incidentally, not hyphenated):
Merriam-Webster:
able to predict what will or might happen in the future
Dictionary.com:
wise, as in foreseeing future developments:
a farsighted statesman.
carry no geographic restriction.
Forward-looking has a similar meaning:
Merriam-Webster:
concerned with the future or planning for the future
Dictionary.com:
planning for or anticipating possible future events, conditions, etc.;
progressive.
Words such as wise, sensible, sage, sagacious,
and perspicacious are listed as synonyms for the above:
perspicacious:
Cambridge English Dictionary:
quick in noticing, understanding, or judging things accurately:
His perspicacious grandfather had bought the land as an investment,
guessing that there might be gold underground.
Merriam-Webster:
having or showing an ability to notice and understand things
that are difficult or not obvious
Other suggested synonyms include intuitive, prophetic,
and psychic, but I guess these are not what you want
(with the possible exception of intuitive).
Footnote:
A more literal definition of farsighted,
which is frequently listed as the primary definition
(especially when it is not hyphenated), is:
Cambridge English Dictionary:
- long-sighted
- able to see things clearly that are far away
but not things that are near you:
I’m so far-sighted, I can’t read the newspaper without my glasses.
Dictionary.com:
- seeing objects at a distance
more clearly than those near at hand; hyperopic.
- seeing to a great distance.
The antonym of this sense of farsighted is nearsighted:
Merriam-Webster:
unable to see things that are far away :
able to see things that are close more clearly
than things that are far away
while the antonym of the first sense is shortsighted:
Merriam-Webster:
not considering what will or might happen in the future;
lacking foresight
although some people use these terms interchangeably.
(Both of these words (especially shortsighted) can be hyphenated.)
Best Answer
Witness to is more of an action/verb. You use it when you say someone is being witness to hence he is witnessing.
Witness of is more of a noun form where the person has been a witness of something.
With witness to you are describing the act and with witness of you are describing the person.