Does Night Mode Cut Blue Light?

Many gadgets nowadays have a night mode feature that helps alleviate eye strain and ease you into sleep by reducing the blue light emitted. But does that mean that the feature cuts the blue light entirely? Let’s explore further.

What is Blue Light?

Blue light is a type of high-energy visible (HEV) light that is emitted by electronic devices such as smartphones, laptops, and televisions. This type of light has a short wavelength and can affect your sleep patterns by reducing the production of melatonin – the hormone that regulates your sleep-wake cycle.

What is Night Mode?

Night mode, also known as blue light filter, is a feature that reduces the amount of blue light emitted by electronic devices. The feature adjusts the display colors by filtering out the blue light and replacing it with warmer tones that are less harmful to our eyes, especially during the night.

Does Night Mode Cut Blue Light?

Night mode does not entirely cut blue light, but rather reduces the amount of blue light emitted by the device. Studies have shown that this reduction can vary from 10% to as much as 90% depending on the device and its specifications. Therefore, while night mode may not cut blue light entirely, it helps reduce the exposure to blue light that could affect our sleep patterns and eye health.

The Importance of Reducing Blue Light

Reducing blue light exposure is essential for several reasons:

  • Improving Sleep: Exposure to blue light has been shown to disrupt the production of melatonin, leading to sleep disorders and sleep deprivation.
  • Reducing Eye Strain: Extended exposure to blue light can cause eye strain, dry eyes, blurred vision, and headaches.
  • Preventing Macular Degeneration: Studies have suggested that too much exposure to blue light can damage the retina, thus leading to macular degeneration, which causes permanent vision loss.

How Night Mode Works

Night mode or blue light filter works by adjusting the colors of your device’s display. The feature reduces the amount of blue light emitted and changes the color temperature by replacing it with warm tones like yellow or orange, which are less harmful to the eyes. This adjustment can occur automatically, depending on your device settings, or manually when you activate the feature in your device’s settings.

The Pros and Cons of Using Night Mode

While night mode can help reduce the amount of blue light exposure, it also has some pros and cons:

Pros Cons
Improves sleep quality May distort color accuracy
Reduces eye strain May reduce the perception of contrast
May help prevent macular degeneration May reduce visibility in bright light

Who Can Benefit from Night Mode?

Night mode can benefit anyone who uses electronic devices regularly, especially during the night. Some groups that can specifically benefit include:

  • Night Owls: People who work or spend time on their devices during the night could benefit from night mode to help regulate their sleep patterns.
  • Students: Students who spend hours studying on their devices can reduce eye strain and improve focus by activating night mode.
  • Individuals with Eye Conditions: People who are vision-impaired or have eye conditions such as dry eyes or macular degeneration can benefit from reducing blue light exposure.

How to Activate Night Mode?

Activating Night Mode or Blue Light Filter varies across devices. Here are a few examples of how to activate it:

  • On iPhone or iPad: Go to Settings -> Display & Brightness -> Night Shift.
  • On Android Devices: Go to Settings -> Display -> Blue Light Filter.
  • On Windows 10 Devices: Go to Settings -> System -> Display -> Night Light.


While night mode may not entirely cut blue light, it helps reduce blue light exposure emitted by electronic devices, especially during the night when our eyes are most susceptible to the harmful effects of blue light. Hopefully, this article has shed some light on what night mode is, how it works, and who can benefit from this feature.


  • Q: Does night mode cut out all blue light?
  • A: Night mode does not entirely cut blue light, but rather significantly reduces the amount of blue light emitted by the device.

  • Q: Can night mode hurt your eyes?
  • A: Night mode can help reduce eye strain and prevent eye damage from blue light exposure. However, it can distort color accuracy and reduce visibility in bright light.

  • Q: Can night mode help with eye strain?
  • A: Yes, Night mode can help alleviate eye strain by reducing blue light exposure, especially when using your device in low light conditions.

  • Q: Can night mode help you sleep better?
  • A: Night mode can help regulate your sleep patterns by reducing the amount of blue light exposure that can disrupt the production of melatonin, which is crucial for regulating sleep-wake cycles.


  • TwelveSouth (2020). Why Night Shift Means Better Sleep. Retrieved from
  • American Optometric Association (2021). Blue Light and Your Eyes. Retrieved from
  • Harvard Health Publishing (2018). Blue light has a dark side. Retrieved from
  • Protect Your Vision (2020). How to Turn On Blue Light Filter on Your PC, Mac, iPhone, or Android Phone. Retrieved from

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