It was written intended to be a dialogue, and during live versions sometimes Robin performs it as a duet. But it's clearly a dialogue between a person locked up in his own world and not willing to open up, only seeing the things he wishes to see, and another person encouraging him to open up for new experiences. "Why don't you open your eyes, you might like what you find" would be the response to "Like you said, I guess that maybe I'm blind".
It was written intended to be a dialogue, and during live versions sometimes Robin performs it as a duet. But it's clearly a dialogue between a person locked up in his own world and not willing to open up, only seeing the things he wishes to see, and another person encouraging him to open up for new experiences. "Why don't you open your eyes, you might like what you find" would be the response to "Like you said, I guess that maybe I'm blind".