He’s got a goofy look. It was later discovered that the actor basically took it too far and intentionally overly opened his eyelids for every damn take. That commitment to being on the trek spectrum earned the character lifetime membership onto the internet.

The bulging eyes

apart from what the other comment said, yes, there is a lot more of him in ds9. and ds9 is one of the best treks, so if you haven't seen it, i almost envy you the chance to see it for the first time. except for the unfortunate question of technical quality, which really is not up to today's standards.