crystalline lens vs lens of the eye

crystalline lens and lens of the eye both are nouns.

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

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

crystalline lens and lens of the eye: 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 crystalline lens include lens.

crystalline lens (noun)	lens of the eye (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