farsightedness vs hypermetropia

farsightedness and hypermetropia both are nouns.

Word	Noun	Adjective	Verb	Adverb
farsightedness	Yes	No	No	No
hypermetropia	Yes	No	No	No

As nouns, farsightedness and hypermetropia are synonyms defined as:

farsightedness and hypermetropia: abnormal condition in which vision for distant objects is better than for near objects

Other synonyms of farsightedness include hypermetropy, hyperopia, longsightedness.

As nouns, hypermetropia is a hypernym of farsightedness; that is, hypermetropia is a word with a broader meaning than farsightedness:

farsightedness: a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
hypermetropia: abnormal condition in which vision for distant objects is better than for near objects

Other hypernyms of farsightedness include farsightedness, hypermetropy, hyperopia, longsightedness.

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