Here the "eyes" represent their desires and "eyes full" means they constant want something. Alternate translation: "They constantly want to commit adultery" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here the word "hearts" refers to the thoughts and emotions of the person. Because of their habitual actions, they have trained themselves to think and act out of covetousness. (See: [[rc://en/ta/man/translate/figs-metonymy]])