Be wary of your sunglasses

The protection of frames and lenses against ultraviolet radiation is usually not up to international recommendations

It would be fantastic for health if eyeglasses From sun From the beach volleyball players or mask cyclists, they have been adopted more widely. Since they completely cover their eyes, these models protect them from widespread ultraviolet radiation (UV), harmful to vision when excessive.

Reflects from the ground, from the walls of the buildings, from the sand of the beach or from the sea, the widespread ultraviolet radiation arrives through the side spans between the face and the glasses, reflect the lens internally and affects the eyes, usually not protected by glasses with more committed frames. The electromagnetic wave from the sun’s rays, UV radiation is divided into three ranges: UVC, which varies from 100 to 280 nanometers (NM); UVB, from 280 to 315 Nm; and grapes, from 315 to 400 nm.

“The frames play a key role in the protection of the eyes against UV radiation,” says Liliane Ventura physics of the São Carlos engineering school from São Carlos University of San Paolo (EESC-USP), who has been working in this sector for about 30 years.

The lenses of sunglasses, whose requirements for the protection of eyes against UV radiation are established in Brazilian and international standards, require protection of up to 380 nm. In 12 glasses tested by the researcher Mauro Masili of the EESC Ophthalmic Instrumentation Laboratory, coordinated by Ventura, it was discovered that a number of ultraviolet rays much above the limit value determined by the International Commission for non -ionizing radiation (ICNIRP) has reached the eye. Total sample, 11 objectives had a UV380 protection and a UV400. A description of the results is found in the January issue of the research in the biomedical engineering magazine.

“The lens of sunglasses sold in the country is within what national standards ask for,” says Liliane. “The problem is that Brazilian and international standards are not sufficient for the total protection of the eyes, because they evaluate only the lenses and do not consider the frames”.

According to her, the legislation should be revised. The limits of the wavelength for solar radiation filters suggested by the Brazilian association of technical standards (Abnt) are 280 to 380 nm; those of World Health Organization (WHO) And from ICNIRP it reaches 400 nm. “With the limit of 380 Nm filters, UV solar radiation in Brazil exceeds 49% of the maximum daily dose that the eye could receive, according to the limits established by ICNIRP,” says Ventura.

In 2013, it was established that sunglasses in Brazil had to filter radiation up to 400 Nm, but this guide was valid only for two years. In 2015, the limit returned to 380 Nm with the adoption of the standard of the international standardization organization (ISO), based in Geneva, Switzerland.

“After 2015, there was no movement to consider the results of scientific studies and adapt the rules to the Brazilian reality, as made in Australia, a country in the same range of Brazil latitude and where the limit is 400 Nm”, comments the biologist and optical technique that establish themselves for optical products, which establish products for the products optic, which establish products for the products, which establish products, which establish products, Optica, which establish products for optical products, which establish products for optical products, which establish products for optical products, which establish products for optical products, which establish products for optical products, which establish products for optical products, which establish products for optical products, which establish products for optic products, which establish products for products. CB49 and CB32 optical products and equipment.

Roberto Tenadini, executive director of the road, Rio Grande Do Photographic and Cinematographic Union of the Photographic and Cinematographic Detail Sul (SinDiPtica-Ts), warns of another problem: frames and lenses of low quality offers in unfortunate factories, which do not have a technical guardian and a street vendors. “In general, people are looking for fashion, which is not always linked to quality products,” he comments.

In January, the union was launched on the Rio Grande do coast on a campaign that faced the different aspects of exposure to UV rays. With the theme “Protect your eyes, wear quality sudden glasses”, there was a distribution of posters and fans. The initiative also underlined the importance of using daily sun protection, especially in the sunniest days and on the beach.

This text was originally published by Fapesp Research according to the Creative Commons CC-BY-NC-NC license. Read the original here.

Source: Terra

Ben

Ben Stock is a lifestyle journalist and author at Gossipify. He writes about topics such as health, wellness, travel, food and home decor. He provides practical advice and inspiration to improve well-being, keeps readers up to date with latest lifestyle news and trends, known for his engaging writing style, in-depth analysis and unique perspectives.