I guess you could try going to Target with your eyes closed. You'd have to find someone to go with you if you just want to browse. (On a computer, your browser can read aloud the menu options, so you can follow your fancy.) Once you find something, you have to ask someone how much it costs. (Your computer could have read that for you.) Will the person describe the item for you in detail, or will they let you take it out of the package to hold it in your hands? (The computer reads dimensions, materials and descriptions.) By the way, how'd you get to target? You didn't drive, so someone drove you, or you took the bus. You gonna carry that purchase home on a bus?
I don't know any blind people, so I don't know what they have to go through, nor how capable they actually are when facing the challenges I've "imagined" above, so I'm just tossing out an idea or two to answer the question, "Why would he want to shop online in the first place?"