a blind photograher

below is quoted from a story book The history of LOVE:-
a short story which i find it quite meaningful.
guide: "he" refers to a photograher who was almost completely blind
"she" refers to an ordinary woman who has lost her husband

He asked if he could take a picture of her.When he raised up the lens and looked through it,she asked what he saw."The same thing i always see,"he said."Which is?""A blur," he said."Then why do it?"she asked."In case my eyes ever heal," he said. "So i'll know what i have been looking at."

beautiful, isn't it?
wonder whether it's a true story or it's just a story.