shortsighted vs shortsightedness

shortsighted is not a noun while shortsightedness is a noun.

Word	Noun	Adjective	Verb	Adverb
shortsighted	No	Yes	No	No
shortsightedness	Yes	No	No	No

shortsighted (noun)	shortsightedness (noun)
	a lack of prudence and care by someone in the management of resources
	(ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred

shortsighted (adjective)	shortsightedness (adjective)
unable to see distant objects clearly
lacking foresight or scope
not given careful consideration