photoretinitis vs visual defect

photoretinitis and visual defect both are nouns.

Word	Noun	Adjective	Verb	Adverb
photoretinitis	Yes	No	No	No
visual defect	Yes	No	No	No

As nouns, visual defect is a hypernym of photoretinitis; that is, visual defect is a word with a broader meaning than photoretinitis:

photoretinitis: damage to the retina resulting from exposure of the eye to the sun without adequate protection
visual defect: impairment of the sense of sight

Other hypernyms of photoretinitis include vision defect, visual disorder, visual impairment.

photoretinitis (noun)	visual defect (noun)
damage to the retina resulting from exposure of the eye to the sun without adequate protection	impairment of the sense of sight