The Green light is the symbol of the story, and it is showed several times in the novel. It appears in “the end of a dock”(P21) and Gatsby stays around the sea alone. And when Gatsby chats with Daisy, he mentions that Daisy has “a green light that burns all night at the end of the dock”, it directly reveals the meaning of the green light, it is the shadow of Daisy, and it is the dream, the hope, the youth and the love. At the end of the story, even if, Gatsby died in the water, Nick mentions that Gatsby “believe in the green light”. In the whole of Gatsby’s life, he pursues his own dream and never give it up. The green light
Otherwise, the eyes of Doctor T..J. Eckleburg has specific meaning in the story. In my opinion, it symbolized the tragedy, and God’s eyes. Because after the eyes of Doctor T.J. Eckleburg appears, something always comes out directly or indirectly. For instance, “the giant eyes of Doctor T.J. Ecklebury”(P124) shows up before Gatsby, Tom, Daisy, Jordan and I go to the city. Surprisingly or not, Myrtle Wilson died. On the other hand, the conversation between Michaelis and Mr. Wilson in chapter eight, both of them notice “the eyes of Doctor T.J. Ecklebury had emerged, pale and emormous”, it not just a coincidental(P160). After that, Gatsby and Wilson died. It is kind of straight forward.
I totally agree with your point about Dr. Eckleburg’s eyes symbolizing tragedy. I believe his eyes’ symbolizes the god’s vision and shows the sign of dangerous. I also agreed that the green light is the dream that Gatsby believes in, which is Daisy. He never forgots Daisy and he’s been trying to make Daisy think that he is the best and he is wealthy enough to marry Daisy.