Why can't hearing aids be bought directly online?

Hearing aids belong to the second class of medical devices equipment (the same belongs to the X-ray film, ultrasound, biochemistry, etc.), according to national regulations, need to control its safety and effectiveness.

So that hearing aids can not be sold on the Internet, it is generally recommended to the professional fitting center to go to the fitting.

The reasoning is simple: if you don't go through a formal fitting process, it's easy to buy a hearing aid that doesn't fit your situation.

The hearing aids that you buy online may either over-amplify the sound, making it very loud and harsh, or under-amplify the sound, making it hard to hear when you wear the hearing aids. It's not worth it if you make a mess out of something that's supposed to be good.