system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do blue-light filters for glasses work? And what is the purpose of filtering blue light?
gpt
**The Belief**: Blue light reminds our brains of daylight, and therefore causes our brains/bodies to produce chemicals that keep us awake

**How glasses work:** Just like any type of light filtering, the glasses are just made of materials that block blue light from passing through them, but still allow other colors to pass through. This is usually done by tinting them yellow-ish. 

**In reality**: Probably snake oil. As more information comes out, it's likely that the original studies weren't representative of the actual data and blue light probably doesn't affect anything outside of the margin of error.