How does Raymond Carver use imagery in Cathedral?

Imagery:

On her last day in the office, the blind man asked if he could touch her face. She agreed to this. She told me he touched his fingers to every part of her face, her nose—even her neck! She never forgot it. She even tried to write a poem about it.

Imagine a woman who could never see herself as she was seen in the eyes of her loved one. A woman who could go on day after day and never receive the smallest compliment from her beloved. A woman whose husband could never read the expression on her face, be it misery or something better. Someone who could wear makeup or not—what difference to him? She could if she wanted, wear green eye-shadow around one eye, a straight pin in her nostril, yellow slacks, and purple shoes, no matter. And then to slip off into death, the blind man’s hand on her hand, his blind eyes streaming tears—I’m imagining now—her last thought maybe this: that he never even knew what she looked like, and she on an express to the grave.