graph vs eye chart

graph and eye chart both are nouns.

Word	Noun	Adjective	Verb	Adverb
graph	Yes	No	Yes	No
eye chart	Yes	No	No	No

As nouns, eye chart is a hyponym of graph; that is, eye chart is a word with a more specific, narrower meaning than graph:

graph: a visual display of information
eye chart: a chart that is read from a fixed distance; used as a test of vision

graph (noun)	eye chart (noun)
a visual representation of the relations between certain quantities, represented as points, plotted with reference to a set of axes	a chart that is read from a fixed distance; used as a test of vision
a visual display of information
a written symbol that is used to represent speech

graph (verb)	eye chart (verb)
represent by means of a graph
plot upon a graph