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> To protect your eyes from blue light, Karunarathne advises to [...] avoid looking at your cell phones or tablets in the dark. Can someone explain why it woul
by rgrove 8y ago
> To protect your eyes from blue light, Karunarathne advises to [...] avoid looking at your cell phones or tablets in the dark.
Can someone explain why it would be worse to look at a cell phone in the dark? It's emitting the same blue light (or less, if the display gets dimmer) as it is in a bright environment. Why is that light more harmful in a dark environment?
- CapitalistCartr 8y agoYour pupils are dilated; you're receiving more light.
- deleted 8y ago[deleted]
- lawlessone 8y agoI'm not a doctor but in a dark environment your pupils would be less constricted. From what i heard this is also why sunglasses that don't block UV light are worse than not having sunglasses at all.
- colanderman 8y agoYour pupils are more dilated, due to the surrounding darkness, and hence let more light in. If you were to dim your screen enough to compensate, it would likely be too dark to read.
- kjullien 8y agoBecause of the way your eyes work. If it is bright, your pupil will be shrunk, to not be blinded by the luminosity. When it is dark, your pupil will be opened wide up. It is this principle that camera apertures are based on. Now if you have your pupil wide open in a completely dark environment and put a 100% brightness screen at ~10cm of your eyes, what do you expect will happen ? Our eyes are made for nature, that means day and night, now we have technology that is akin to a handheld sun and you use this at night at 10cm of your face, our eyes are simply not equipped to handle this.
- Ntrails 8y agoMy phone (unlike my PC, or a TV) is smart, and thus dynamically alters brightness based on ambient light. It's pretty cool and certainly mitigaets the above somewhat
- rory096 8y agoAt least on my phone (LG G5), the lowest brightness setting is still incredibly bright in an otherwise dark room. I use Twilight[0] to dim it further, though unfortunately Google changed Android so it can't affect the soft buttons. (Which is fine for almost all apps because the soft button bar is black, but of course Chrome changes it to white with no way to fix it.) [0] https://twilight.urbandroid.org https://twilight.urbandroid.org
- mywacaday 8y agoThanks for prompting me to go back and check the settings on the Darker(https://play.google.com/store/apps/details?id=com.mlhg.screenfilter&hl=en https://play.google.com/store/apps/details?id=com.mlhg.scree...) looks like it now dims the soft navigation buttons
- doh 8y agoiOS is the same. Even on the warmest setting and lowest brightness it's still very bright. Unfortunately, there is no app to do anything about it like there is on Android.