Eye contact

The  "H" for my husband is in his eyes. He has difficulty maintaining eye contact and seems to not be paying attention. I realize that for him to concentrate he has a hard time listening or talking while he's looking at someone. I recently realized that I don't feel like he's paying attention to me or really ever fully engaged. When he does make eye contact it feels much better to me, like I matter. We are wonderiG if anyone can offer some exercises for us to practice on having more eye contact or any suggestions on how to improve this?