hypermetropia vs ametropia

hypermetropia and ametropia both are nouns.

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

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

hypermetropia: abnormal condition in which vision for distant objects is better than for near objects
ametropia: (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia

hypermetropia (noun)	ametropia (noun)
abnormal condition in which vision for distant objects is better than for near objects	(ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia