only have eyes for (something)

To be solely focused on or interested in something, often at the expense of other things. He could have stayed in his position at the company and retired a millionaire, but he only had eyes for being elected to public office. Our government only has eyes for the big cities, leaving our small rural towns to rot by the wayside.

only have eyes for someone

Fig. [to be] loyal to only one person, in the context of romance. Oh, Jane! I only have eyes for you! Don't waste any time on Tom. He only has eyes for Ann.

only have eyes for something

have eyes only for something

If someone only has eyes for a particular thing, they are interested only in that thing. When Ian's playing hockey, he has eyes only for the game.

only have eyes for

be exclusively interested in or attracted to.