My littlest leopard gecko has always been a tad unhealthy. He was the tiniest lizard from his clutch, and he already has metabolic bone disease... His tail was also eaten off by a violent sibling (has since fully grown back and looks healthy)... Now his eye has started shrinking / deflating?
It was extremely difficult to take a picture of, but I'll try my best to get a few ones that explain what I'm seeing.
In the picture below, you can see the very thick eyelid compared to his right eye.
In the other pictures, he's mostly squinting.. Every time I tried to get a picture of the eyeball when it was open, he closed it...