“Anti-blue light” glasses. Glasses with yellow and red lenses.

We spend hours in front of screens, staring at phones, computers, or tablets, even before bed.

In recent months, athletes such as Marcos Llorente and Álvaro Morata have become increasingly popular with "blue light blocking" glasses and glasses with red lenses that promise to protect the eyes, improve sleep, aid recovery, and boost athletic performance.

But how much truth is there in all this? Do they really work, or is it just another fad?

At Evolution Physiotherapy, we analyze the scientific evidence to help you make an informed decision.

What are light filtering glasses and how do they work?

Glasses with yellow/amber lenses that protect against blue light or blue-blocking

• They partially filter short-wave light (≈400–500 nm).
• They seek to reduce eye strain from screens and, in theory, improve sleep.
• Transparent or slightly amber tint.
• They block between 10 % and 40 % of the blue spectrum.

Glasses with red lenses or “red-light blocking glasses”

• They block almost all blue and green light (≈400–550 nm).
• Only red/orange lengths are allowed to pass.
• They are used above all at night, to avoid circadian stimulation.
• They promise to promote the natural production of melatonin and improve rest.
• They block between 95-100% of the blue or green spectrum.

What the scientific evidence says about red and anti-blue light glasses

Limitations of studies on light-filtering glasses

• Most studies have small sample sizes, very short follow-up times, and poor measurement consistency.
• They are based on blue light exposures far above those to which humans are exposed with common electronic devices.
• “Blue filter lenses” vary greatly in the wavelengths they block, percentage, tints, etc., so comparing them is complicated.
• Many results are based on subjective assessments by users versus objective values that show no significant differences.
• It is possible that the perceived benefits are due to other factors (change in sleep habits or the placebo effect).

Red vs. amber/yellow lenses

Since red lenses block a very high portion of the blue/green spectrum, they could theoretically have a greater impact than moderate blue filter lenses.

In practice, there are not enough large randomized trials evaluating exclusively red lenses in sporting or high-performance populations.

Therefore, the "practical conclusion" is: there may be an effect on improving sleep parameters (especially efficiency, latency, and subjective quality) in subgroups with sleep disturbances or significant nighttime exposure; but it is not guaranteed, and the effect is not strong in the general population without sleep problems.

Red and yellow lens glasses. A great marketing strategy: Evolution Vision.

Red glasses and blue light filters are the perfect example of how marketing can get ahead of science.

Brands have sold an emotional solution to a real problem (fatigue, sleep, screen time), without studies backing its widespread effectiveness, and have pocketed millions of dollars through advertising campaigns featuring well-known influencers and athletes. Here is an article about some of these characters.

At Evolution, we believe in the opposite approach: educate first, sell later.

Beyond trends, true recovery lies not in a color filter, but in taking care of your habits, your rest, and your movement.

Light matters, but your health is trained, not bought.

EVOLUTION Practical Recommendations

As advice from our Evolution physiotherapy clinic and as health experts, we recommend that before spending money on these types of glasses, you improve the quality of your habits.

• Brightness and contrast: Dims the screen brightness in dark environments; avoids high background/monitor contrasts.
• Use night/warmth mode on devices at night (reduces the blue component and luminosity).
• Improve your sleep hygiene: Create a routine, dim the lights in your home 1–2 hours before bedtime, and limit stimulating content such as television before bed.
• Improve your work environment: Set the screen distance/height, avoid reflections and schedule breaks or pauses.

In athletes or active people Sleep is your best recovery tool from any type of yellow or red lens.

• Prioritize darkness and real rest rather than trendy gadgets.
• Sleep well It is more effective than any color filter.

Evolution Physiotherapy in Alcalá de Henares against glasses with red and yellow lenses

In the clinic, we see every day how fatigue, muscle tension, and lack of recovery affect athletic performance and overall well-being. And that's where advanced physical therapy comes in:

• Manual quality treatment on the musculoskeletal system.
• Diathermy as an anti-inflammatory, analgesic and enhancer of biological tissue healing processes.
• Functional percutaneous neuromodulation as one of the most powerful tools for re-educating the nervous system, reducing pain and improving muscle function.

In summary:

Before investing in red glasses, invest in yourself.

Sleep better, move more, eat well, and let your body recover with techniques that truly create physiological changes.

At Evolution, we don't sell filters: we help you train your health.