hyperopia vs presbyopia

hyperopia and presbyopia both are nouns.

Word	Noun	Adjective	Verb	Adverb
hyperopia	Yes	No	No	No
presbyopia	Yes	No	No	No

As nouns, presbyopia is a hyponym of hyperopia; that is, presbyopia is a word with a more specific, narrower meaning than hyperopia:

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

Other hyponyms of hyperopia include farsightedness.

hyperopia (noun)	presbyopia (noun)
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