What has andrew said about blue blockers?

Andrew Huberman provides detailed insights on the use of blue blockers:

1. Daytime Use: He advises against wearing blue blockers during the day as they block blue light, which is essential for alertness and setting circadian rhythms properly. Blue light is crucial for keeping us awake and alert during the day, and blocking it can have detrimental effects that are generally reversible once you stop wearing them during daylight hours 1.

2. Evening Use: The appropriate time for blue blockers is in the evening or at night when you're heading towards sleep, as they can help reduce exposure to artificial light that can impair melatonin production, crucial for sleep 1.

3. General View: Huberman, along with his colleague Samer Hattar, noted that eliminating specific wavelengths of light isn't natural for our visual system. Instead of relying heavily on blue blockers, they emphasize managing light exposure throughout the day, such as dimming lights in the evening 1.

4. Eye Health: Blue light received during the day is beneficial for circadian entrainment. Blue blockers' use during the day may interrupt these processes, potentially affecting mood and alertness negatively. Blocking UV light in general is seen as beneficial for long-term eye health, differentiating from blue light 2 3.

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     1

     Light and Circadian Rhythms

     00:22:43
     
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     2

     UV Protection Insights

     01:31:35
     
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     3

     Eye Health Insights

     01:33:59
     

In summary, Andrew Huberman recommends harnessing natural light to its fullest advantage during the day and merely limiting overall light exposure through methods like dimming later in the evening rather than relying on blue blockers throughout the day.