It seems to me that it's is a simple case of the eyeball not fitting the eye socket: the white edge is the outer curve of the eyeball, and the red is the inner surface of the eye socket. I could be wrong though.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)