Yes, FARSIGHTEDNESS is a Scrabble word!

Letter values in Scrabble US: F 4, A 1, R 1, S 1, I 1, G 2, H 4, T 1, E 1, D 2, N 1, E 1, S 1, S 1.

Is it a valid word?

FARSIGHTEDNESS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
abnormal condition in which vision for distant objects is better than for near objects
seeing ahead; knowing in advance; foreseeing

Not playable in Scrabble US: HYPERMETROPY, PROSPICIENCE.