system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do hearing aids work? Are they just blasting what they hear directly into the ear potentially causing more damage?
gpt
Hearing aids aren’t just amplifiers - they filter and normalize frequencies to adjust to the weaknesses of the wearer’s ears. They are tuned for individuals by professional fitters. To answer your follow-up question, hearing aids can actually protect against loud sounds since they can block and selectively filter.