Are you blind?

On the phone the other day, I had an interesting conversation with a sales representative. At the end of the discussion, I had to explain that I was blind and could not see the picture on my computer screen. There was a silence. "you're blind." "Yes." "Half blind?" "No. Really blind." "Fully blind?" "Yes." "All the way blind?" "Yes." "Oh." So I got to wondering, does half blind mean blind in one eye or blind in both eyes half way. She finally finished asking how blind I was. smile! She was nice and not condescending but seemed totally perplexed by my blindness.