The Great Gatsby

I am reading "The Great Gatsby"

I thought it was an easy book. But on reading 1 page, I realized my prediction was not right. TT_TT

What do you think of this novel? Is it easy to read??

Anyhow

would you explain the next paragraph??

I don'  understand whether "the eyes of Doctor T. J. Eckleburg" is a metaphorical expression.

And plz make me understand the red sentence.

"But above the gray land and the spasms of bleak dust which drift endlessly over it, you perceive, after a moment, the eyes of Doctor T. J. Eckleburg. The eyes of Doctor T. J. Eckleburg are blue and gigantic—their retinas are one yard high. They look out of no face, but, instead, from a pair of enormous yellow spectacles which pass over a nonexistent nose."

Have a great day~!!!!