Difference between daytime and nighttime blue light filter glasses

We live connected to screens almost all day long. We work, study, edit, design, answer messages, and when we think we're done, we settle in to watch a show or scroll through TikTok. Exposure to blue light is no longer an exception: it's part of our daily routine.

And although more and more people are using blue light filtering glasses, not everyone knows that there are two very different types: daytime and nighttime. Both protect your eyes, but each is designed for a different time and purpose.

We'll explain what differentiates them, when you should use them, and why combining them can change your rest and visual performance.

What is blue light and why does it matter to distinguish between day and night?

Blue light is a part of the visible spectrum, specifically high energy and short wavelength (between 380 and 500 nm).
During the day, the sun's natural blue light regulates the circadian rhythm, keeps the brain active, and improves mood.

The problem arises when that light —emitted by screens, LEDs and devices— also invades nighttime hours, altering the production of melatonin, the sleep hormone.
That's why not all blue light filter glasses are suitable for all day: your eyesight needs are not the same at 10:00 in the morning as at 23:00 at night.

If you want to understand more about how blue light affects sleep, read this full article.

Daytime blue light filter glasses: protection without isolating you from the energy of the day

Daytime blue light filter glasses are designed for prolonged use in front of screens during the day: work, study, online classes or digital design.

Main features

  • They partially filter blue light (between 30% and 60%), letting through the beneficial part that maintains attention and energy.
  • Its lens is transparent or slightly yellow, so as not to alter the colors of the screen.
  • They are optimized for environments with natural or moderate artificial light.

Benefits

  • They reduce eye strain, headaches, and dry eyes.
  • They improve concentration and visual comfort during long days.
  • They maintain true colors, ideal for designers, content creators, or students.

In short: daytime glasses help you see better, without losing focus.
At Krudo, the Blue Day Filter models are designed for those who live in front of screens, but also value style in every detail.

Nighttime blue light filter glasses: real rest and disconnection

Blue light filter glasses are a modern sleep aid. They not only protect your eyes, but also send the brain the signal that "it's nighttime."

Main features

  • They block almost all blue light (up to 99%).
  • Its lens has a deep red or amber tint, designed to eliminate any visual stimulation that interferes with sleep.
  • Ideal for use from 8:00 PM onwards or one hour before going to sleep.

Benefits

  • They promote the natural production of melatonin.
  • They make it easier to fall asleep and improve the quality of rest.
  • They reduce eye strain accumulated during the day.

The red filter isn't just for looks (even though it looks brutal). It's pure visual science.
That's why our Krudo Night Core model has become the key piece for those looking to rest without disconnecting from the digital world.

The perfect combination: one for day, one for night

Just as you don't use the same shoes for training and for sleeping, your eyes shouldn't be exposed to light with the same filter all day long.

During the day, you need energy and concentration: that's where daytime blue light filter glasses come in.
At night, the goal changes: to calm the nervous system, help the body rest, and prepare you for better sleep.

Using them in combination has a multiplying effect:

  • Less eye strain.
  • Improved cognitive performance.
  • More deep rest.

How do you know which one you need first?

It depends on your lifestyle:

  • Do you work many hours in front of a computer or in bright environments? Start with daytime hours.
  • Do you use your mobile phone or laptop at night, have trouble sleeping, or suffer from mild insomnia? Nighttime sleep aids are your priority.
  • If your day combines both scenarios, use both: your eyesight (and your rest) will thank you.

Beyond the filter: design, comfort and style

At Krudo we believe that taking care of your eyes shouldn't be at odds with aesthetics.
Our glasses combine technology, urban design and lightweight materials, designed so you can wear them all day without noticing them.

Each model is manufactured with precision and specially treated lenses to guarantee real protection and distortion-free visual comfort.
Because visual health can also be part of your identity.

Discover how we combine visual performance and style in our complete Krudo eyewear collection.

Conclusion: two moments, two filters, one same vision

Day and night don't require the same thing.
Your body has its own rhythm, and so do your eyes.

Daytime blue light filter glasses keep you focused and comfortable while you work.
Nighttime lamps help you disconnect, relax your eyes, and sleep better.
And both, together, restore the visual balance that screens take away.

Your eyes deserve rest, style, and protection.
Your gaze deserves Krudo.

Discover the Day Filter and Night Core models on our website and find the balance between performance and rest.
👉 Explore the full collection at kurdostore.com

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