Sunlight is the main source of blue light, being outdoors during the day is how we get most of our exposure to it. However, now we have many indoor sources of blue light, including fluorescent and LED lighting and flat-screen TVs. Here we explain why it is important to take care of our eyes in today's digital generation.

Ultraviolet radiation, in moderation, also has beneficial effects, such as helping the body make adequate amounts of vitamin D.

However, ultraviolet rays have more energy than visible light rays (including blue light), so they are capable of producing changes in the skin that create a tan. Tanning booth bulbs emit a controlled amount of UV radiation.

Too much exposure to ultraviolet rays causes a painful sunburn and has serious consequences such as burning eyes, trouble for sleeping, eye irritation, a condition called photokeratitis, or snow blindness. Here, some negative effects that blue Light causes:

• The sensation of dry eyes and its many symptoms associated are closely related to CVS (Computer visual syndrome). Dry eyes in ​​users have been linked to the reduction of tear film break time. Regardless of whether it is dry eyes due to production or evaporation, symptoms worsen when carrying out close activities with any type of digital display equipped with emitting LED lights.

• Reading or working with backlit LED displays increases visual fatigue, which manifests itself in the form of symptoms tension and ocular.

• Glare can be defined as the loss of the contrast in the retinal image derived or caused by light scattering or sidelight. There are several types of glare; disabling glare like headlights cars coming head-on when driving at night, after-effects observed after surgery, photorefractive, or cataract. LED lights are on the screens backlit and also in ambient lighting (offices, shops, televisions, etc.). They provide greater brightness more effectively than other types of bulbs, and a large proportion of its spectrum is of lengths of short waves, which increases the visual field and vision peripheral (and what explains its widespread use in the car industry). However, they produce an increased feeling of discomfort from glare than other types of light bulbs, with an increase in discomfort associated with increased blue light from the source of light.

Given the abundance of scientific evidence, eye professionals wonder which is the best way to help patients prevent eye complications. It's really important to offer the patient advice and guidelines for visual hygiene and postural to reduce exposure time to blue light. However, there is no doubt that the use of selective filters to filter out blue-violet wavelengths is the most complete solution to date.

The idea that selective filters can increase the visual ability or reduce glare, trouble sleeping, light scattering and associated harmful effects with the blue-violet wavelengths of the visible spectrum is not new. Many vertebrates (including humans) have intraocular filters that minimize the effects Harmful of light. In the case of humans, it is the lens that filters ultraviolet light and macular pigment that can provide some protection against hazards short-wavelength visible light. In 1933, the Studies by Walls and Judd established a link between the presence of these natural intraocular filters that block blue light are related to the effect of increasing capacity visual, reduce glare and increase background contrast of objects.

Who needs Blue Light Filters?

At this point, we can ask ourselves who is not exposed to Blue Light? The digital dad who shops online, the digital mom who surfs the web pages, the granny who talks on Skype, the man from a businessman who works with a tablet, the boy who chats from your smartphone, the teenager who spends hours playing on the game console. All of us, regardless of our age, can suffer any of the visual complications associated with increased exposure to blue light.

REF:

https://www.pointsdevue.com/sites/default/files/luz_azul_de_las_evidencias_cientificas_0.pdf

https://iovs.arvojournals.org/article.aspx?articleid=2162704

https://www.allaboutvision.com/cvs/blue-light.html