I don't think we've covered your specific case (people with hearing difficulties), but we have covered a lot of stuff about how the health insurance system works, and the various options, browse or search for this info in either the insurance or family matters sections of this forum.

Quick tips: if you are simply buying the basic minimum insurance product then do shop around - it's impossible for someone to say who is the cheapest, premium vary based on age, gender, and (wait for it....) where you live. I used comparis.ch each year to pick the cheapest company for me and I change accordingly. If you are after additional insurances this can be a little more complicated, and unlike the basic insurance companies do not have to accept you.

I did have a friend who had a hearing aid. The insurance paid all the basic costs for it, but he wanted a super-small version which cost a lot of money. He had to wait 10 years for this, but he got it in the end (or he could have paid for it himself if he wanted it sooner).