Bruno Guimarães, Igor Thiago and Matheus Cunha Rafael Ribeiro/CBF An accessory used by Brazilian national team players upon arrival in the United States for the World Cup caught the attention of fans on social media. Blue block glasses, known as 'sleep glasses', with yellow and red lenses, have become part of athletes' routines, due to the promise of improving physical recovery and quality of rest. ✅ Click here to follow the new g1 Santos channel on WhatsApp. Santos businessman Gabriel Barreto, co-owner of Apex Performance, used by athletes such as Neymar Jr., Bruno Guimarães, Bremer and Ederson, says that the models were developed to block part of the so-called blue light, emitted by electronic devices such as cell phones and tablets. He decided to invest in the business due to people's interest in high-yield items. To g1, the doctor and president of the Brazilian Society of Ophthalmology, Oswaldo Ferreira Moura Brasil, informed that from a scientific point of view, the most plausible benefit of lenses with a blue light filter is related to the quality of sleep. "Exposure to blue light at night reduces the production of melatonin, an important hormone for regulating the circadian cycle. By reducing this exposure, these lenses can promote the onset and quality of sleep", pointed out the professional. Now on g1 Oswaldo Brasil, however, pointed out that "there is no robust evidence in the medical literature that the use of these lenses directly improves sports performance, visual capacity or cognitive performance." Investment and popularization Barreto explained that he decided to invest in the business due to the growing interest in practices aimed at health, well-being and high performance. "This biohacking movement, which is small practices to improve your health, is growing around the world," he said. According to the Santos businessman, in Brazil the first famous player to start using glasses was the Paraguayan defender Gustavo Gómez, captain of Palmeiras. After that, other athletes started using it, with the national team's number 10 being the main name. Neymar helped popularize the accessory in Brazil Reproduction/Social media "Neymar liked the concept, used it and, as a result, it also became popular within the Seleção itself," he said. Barreto highlighted that, in Europe, the lenses were already used by athletes such as Cristiano Ronaldo, Erling Haaland and Marcos Llorente. Ederson also joined the technology CBF Do colored lenses have a function? Currently, manufacturers mainly sell two types of lenses. The yellow ones promise to block around 70% of blue light and are recommended for use throughout the day, especially for those who spend many hours in front of screens. Red ones offer protection of up to 95% and are usually used before bed. Doctor Oswaldo Brasil highlighted that, by reducing exposure to blue light, glasses can promote sleep. However, he highlighted that there is no scientific proof that the accessory directly improves the performance or performance of athletes. VIDEOS: g1 in 1 Minute Santos