Betta Fish: Is there something wrong with my betta?

I got this elephant ear betta from a lady who could no longer care for him- he was living in a small filterless jar. I’ve put him in a larger tank with everything he needs to do well and he’s gotten much better.

The issue is he seems to be either very old or partially blind or something. I’ve never kept a betta before- but any other fish I’ve kept will go crazy for this type of live food and gobble it up in seconds. He’s been able to only catch a few and he really seems to struggle….