Yes, OK.

vizes is better I think...

It isn't - it's using the indefinite conjugation endings for an "ik" verb, as iszik is an "ik" verb.

The én form happens to have -em, -om which coincidentally looks like the definite conjugation ending for non-"ik" verbs. That's not usually a problem since most "ik" verbs are intransitive and can't take an object, so they're never used in the definite conjugation anyway.

The need to distinguish "ik" from non-"ik" verbs may be one of the reasons that dictionary list verbs by their third person singular form, e.g. iszik, rather than by the infinitive.