Lichtblock Sera

Lichtblock® Sera Blueblocker glasses

Model	most popular
Protection until	500 nm 550 nm
Graph
Block	Blue light Blue light + parts of the green light spectrum
UV 400 filter	100% 100%
Colour fidelity	■■■■□ ■■□□□
Screen work	■■■■■ ■■■□□
Series / film experience	■■■■□ ■■□□□
Going out in the evening	■■■■■ ■■■□□
Sleep (protection from melatonin suppression)	■■■■□ ■■■■■
Stress reduction for the eye (protection of sensitive photoreceptors)	■■■■■ ■■■■■
Suitable for road traffic	no no

Our lenses block 100% blue light

Glass	Transparent Blue light filter Lichtblock® Blueblocker
100% blue light filter performance	max. 30% 100%
Sleep (protection from melatonin suppression)
Stress reduction for the eye (protection of sensitive photoreceptors)

• Do you spend a lot of time in bright surroundings in the evening?
• Are you often busy with screen work?
• Do you like to watch a film or a series in the evening?
• Do you have problems falling asleep or staying asleep?

Then the use of blueblockers may make sense for you.

The crucial and biggest problem with blue light after sunset is its effect on our nervous system. After dark, the light fools your brain into thinking it's the wrong time of day. This interrupts your sleep cycle and can have a negative effect on your health, especially over a long period of time. Yellow or orange lenses that block 100% blue light can help you protect your sleep cycle and improve your sleep quality.

Difference between LEDs and fire

LED spectrum

We speak of blue light at a wavelength of approx. 380 to 495 nanometres (nm). It is short-wave and very energy-rich light. Modern displays, LEDs and energy-saving lamps have a disproportionately high share of blue light. This stimulates certain photoreceptor cells and can lead to a dysregulation of your sleep-wake rhythm. This can have a negative effect on your hormones and metabolism. (1)

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Fire (candlelight)

Before we were able to turn night into day through the invention of electricity, there were only natural sources of light in the form of fire. The big and decisive difference to today's light sources is the distribution of the light spectrum. Blue and green are hardly present in candlelight, as can be seen in the graph. Furthermore, fire has no flicker effect, which can stress your nervous system. Therefore, fire usually has a calming effect.

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A systematic review by Hester et al. (2) comes to the following conclusion:

Out of the 24 publications focusing on sleep, there was substantial evidence for blue-blocking glasses being a successful intervention for reducing sleep onset latency in patients with sleep disorders, jet lag, or variable shift work schedules. Given the well-established biological mechanism and clinical research showing that blue-blocking glasses are effective for inducing sleep, they are a viable intervention to recommend to patients with insomnia or a delayed sleep phase.

• Our 500 models protect your eyes 100% from blue light and are very comfortable to wear, especially if you still want to see "colours" in the evening.
• Our 550 models protect your eyes 100% from blue light and they still reach into the green spectrum. This can help to accelerate the formation of melatonin.

1. ncbi.nlm.nih.gov/pmc/articles/PMC4763136/
2. pubmed.ncbi.nlm.nih.gov/34030534/

Spectacle dimensions

Spectacle width: 142 mm

Glass height: 40 mm Glass width: 55 mm

Bar width: 18 mm

Temple length: 145 mm

Properties