lens of the eye vs crystalline lens

lens of the eye and crystalline lens both are nouns.

Word	Noun	Adjective	Verb	Adverb
lens of the eye	Yes	No	No	No
crystalline lens	Yes	No	No	No

As nouns, lens of the eye and crystalline lens are synonyms defined as:

lens of the eye and crystalline lens: biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina

Other synonyms of lens of the eye include lens.

lens of the eye (noun)	crystalline lens (noun)
biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina	biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina