How much blue light do we need? How and when should we protect ourselves against the blue light? What are the best blue light blocking glasses? How to test blue light glasses?

There is a long debate on the beneficial and harmful effects of blue light. On the one hand, blue light can be a helpful tool in combating winter depression and insomnia. On the other hand, blue light can permanently damage the human eye. What’s the point of the blue light? What has changed about the artificial light we are exposed to every day? Why does our body need the biological effects of this wavelength? How and when should we protect ourselves against the potential harmful effects of blue light? Read on to discover the good and bad aspects of blue light.
Visible spectrum
The light reaching and entering the human eye is divided into visible light of wavelengths of 380 to 780 nm and invisible light containing light in the ultraviolet range (UV light) and infrared range (IR light).

Experts have been aware for some time that UV light can damage biological tissues such as our skin and eyes. Therefore, people naturally take measures to protect themselves with products such as sunscreen or sunglasses. However, visible blue-violet light also has the potential to damage our eyes. Although the energy of blue-violet light is less than ultraviolet light, it is barely filtered when passing through the eye and reaching the retina. On the contrary, ultraviolet light is almost completely absorbed by the anterior part of the eye and reaches less than 5% of distant areas such as the retina.

The blue component of light between 380 and 500 nm is also known as high energy visible (YEG) light. Particularly blue-violet wavelengths between 380 and 440 nm are considered to be harmful and are thought to be one of the possible causes of photoreetinitis, ie retinal damage caused by high-energy light.

Useful aspects of blue light

Light not only helps us to see, it is also one of the factors that regulate our biological rhythms and affects how we feel in general. The light plays a role in being alert, being focused and productive, and feeling energetic and healthy.

Scientific studies have confirmed the biological effect of light on our bodies. For example, ultraviolet light affects the production of vitamins. Exposure to bright light and especially blue light affects our hormone balance. Hormones in the body regulate how one feels and the sleep-wake cycle. The portion of blue light is relatively high in daylight, but decreases significantly at night.

When it is bright outside, the body releases serotonin, known as one of the “happiness hormones”, and cortisol, a stress hormone. Both of these make us feel awake and active. However, melatonin is thought to be a sleep hormone, and when it is dark, it makes us feel tired and sleep well.

Light, particularly the blue light that reaches the retina, also affects how we feel psychologically. Light therapy is therefore successfully used to treat insomnia and depression in winter. However, as is often the case, “everything must be decided” is still valid. Exposure to too much light also carries certain risks and may even be harmful.

Harmful effects of blue light

Very intense light in the infrared and blue-violet band can damage the human eye. It can cause painful conjunctiva and corneal infection, as well as damage to the eye’s crystal lens (eg cataract) and especially to the retina (macular degeneration).

Therefore, it is very important to wear 100% UV-protected sunglasses in times of intense sunlight, especially when there is a lot of glare, such as water or snowy mountain slopes.

Modern world: light sources with high blue light
From light emitting diodes (LEDs) and Xenon lights to energy-saving light bulbs and electromagnetic radiation emitted from displays, all yeni new light sources tasarlanmış designed to make our lives better and easier, contain far higher levels of blue light than traditional light bulbs. The different spectral composition of the light means that we are exposed to much more severe blue light than before. Could this have a detrimental effect on our vision?

But it should be noted that our eyes are exposed to blue light more than 30 times at a clock outside in a closed air, compared to an hour in front of the screen inside.
Clear glasses with blue light filter
It is reasonable that UV protection is not necessary if clear glasses are generally used indoors. Transparent lenses are made of DuraVision® Blue Protect. As with the blue light filter is possible. But why?

Blue light radiation from light sources or displays may be uncomfortable or tiring for some people’s eyes. The blue filter can provide people with clearer vision: the different wavelengths of visible light are broken in slightly different ways by the cornea and eyepiece, so not all fall into the same focal point in the retina. Such a situation would be familiar to some people – for example, it would be easier to see red and blue more closely, or it would be more tiring to focus on graphics with red, green and blue lines than graphics with the same or similar colored lines.
Clear glasses with blue light filter

Some people feel that light sources with high levels of blue light may make them more sleepless at night. When we enter a dark room, go out at dusk or at night, our eyes go into a different mode of vision. In low light, the human eye changes from green sensitivity to a high-energy blue spectrum. This means that we perceive blue light more intensely, which can create an increased sense of glare. This effect will be familiar to the headlights of the following vehicle, especially to drivers who experience blindness as a result of dazzle, especially in the case of modern Xenon or LED headlights. Blue light filter lenses can create more comfortable vision in these situations.

How digital devices change our vision

Tablets, smartphones and other digital displays not only change the spectrum of light we are exposed to, but also change our visual behavior. It is important to notice that we spend more time looking at objects more closely than ever before. This is usually because the backlighting is too weak. This is a problem even in children: “school myopia” means that children tend to be unable to see the increased distance since they start school.
How digital devices change our vision
If we don’t have enough time to look away, our eyes won’t get enough relaxation and we will “forget” our ability to focus quickly on different distances. This causes digital eye strain. Also, when we look at digital displays, we blink less, so our cornea is less moistened with tear fluid. This can cause eye strain. And worst of all, it can cause a disturbance in our vision. our vision.

How to test blue light glasses?

Blue–light blocking glasses have filters in their lenses that block or absorb blue light, and in some cases UV light, from getting through. That means if you use theseglasses when looking at a screen, especially after dark, they can help reduce exposure to blue light waves that can keep you awake. After you buy your blue light filters, you can still test how good they are at what they do. You can do that by comparing the colour spectra in the two bars below. Ifyour colour perception is top-notch and your monitor shows the full-colour range (red-blue-green), then the two bars should appear to be different. Sometimes the answer is right before your eyes! Blue light blocking glasses can ease digital eye strain, decrease your risk of macular degeneration and increase the clarity of your vision. Just be sure your blue light blocking glasses aren’t blocking beneficial blue-turquoise light. As you can see, the cyan component of the spectrum (which is a mix between blueand green) appears green. The blue component has disappeared. True blueblocking glasses, or lens that filter out >90% blue light, the two spectra should appear very similar.

We listed best blue light blocking glasses for 2019

1- Cyxus Blue Light Filter Computer Glasses

• ⭐BEST BLUE LIGHT BLOCKING GLASSES–Anti harmful blue ray, provide all-day protection, against the detrimental effect high energy visible blue light and UV400.
• ⭐REDUCE EYESTRAIN & SLEEP BETTER–Enjoy your digital time, NO worry about eye fatigue, blurred vision and headache, blue light blocker for your eyes and guardian for your health.
• ⭐DESIGNED FOR AMERICANS–Anti-blue glasses with five hinges and an enhanced nose pad are stronger and more suitable for Americans.
• ⭐BULLETPROOF GLASS MATERIAL LENS–uv blue light bloking glasses women/men are made of PC material, which is stronger and clearer, bring you good visual experience.
• ⭐LIFETIME WARRANTY–We provide lifetime warranty, 100% money back guarantee and friendly customer service.Whether you are a worker, a housewife, or a student. Computers and mobile phones accompany us most of the time. Just “Add to cart “ now!!!!

2. ANRRI Blue Light Blocking Glasses for Computer Use

• ANTI BLUE LIGHT – Anrri glasses can cut 90% of the blue light. Relieving eye fatigue, dry and vision falling.
• REDUCE EYESTRAIN – Enjoy your digital time, NO worry about eye fatigue, blurred vision and headache.
• BETTER SLEEP – Anrri glasses can reduce eye strain and headache, so you can enjoy a restful deeper sleep
• MATERIAL – Frame: TR90 ; Lens: Polycarbonate
• LIFETIME WARRANTY–We provide worry-free lifetime warranty(no man-made)and friendly customer service.

3. SOJOS Small Square Polarized Sunglasses

1 – Multiple mirror colors lenses are available for this style, hoping they can bring you a colorful mood.

2 – Adjustable silicone nose pads fit for all skin types.

3 – 100% UV400 protection PC anti-impact lenses can filter out UVA/UVB rays and reduce the glare.

4. K KENZHOU Blue Light Blocking Computer Glasses

• PREVENT HARMLFULL BLUE RAY: K KENZHOU anti blue ray glasses can effectively obstruct injurious blue ray, electromagnetic wave radiation, and ultraviolet rays. No matter it’s computers, laptops or smart phones, the glasses can always help to prevent harmful blue ray the screens emitted, protecting eyes from invisible injurious blue ray. So that the glasses can protect the eyes from computer visual syndrome (eyes losing focus, vision getting unclear, fatigue, ophthalmic acid, bulging, et).
• REDUCE EYESTRAIN & VISUAL SYNDROME: By preventing the injurious blue ray, K KENZHOU glasses can protect the eyes from computer visual syndrome (eyes losing focus, vision getting unclear, fatigue, ophthalmic acid, bulging, headache, etc.). So you don’t need to worry about hurting your eyes (getting myopia or vision getting declined, or other visual syndrome), just enjoy your digital time. What’s more, our lens have registered FDA and passed FDA Test to ensure impact resistance and safety.

5- LifeArt Blue Light Blocking Glasses,Computer Reading Glasses 

• Blue Blocker Lens: LifeArt lens can block harmful blue light, release your eye fatigue when watching TV and looking at computer. And provide you 100%UV400 protection.
• Reduce Eyestrain and Enjoy Better Sleep: no more eye fatigue, blurred vision and headache during your computer/ ipad/ tablet/ iphone screen time. Better sleep for you, blue light blocker is there for your eyes and guardian for your exquisite life.
• Transparent Lens(Not Tinted Yellow Lens): give you a clear vision when play computer and laptop.
• [Packing list]: 1* eyeglasses; 1* soft clean cloth; 1* hard protection case; 1pair* silicon ear hooks; 1* small screwdriver; 1* blue light blocking test tools.
• [Lifetime Warranty]: you can return the defective products for repairing or exchanging for free at any time without any question. [Kindly Notice]:not including man-made damage.

6- FEIYOLD Blue Light Blocking Glasses

• ☀【Reduce Eyestrain】Prolonged exposure to blue light will cause eye fatigue, blurred vision and headache, just with our computer glasses, you will notice a difference in a few days. Because the glasses block the most harmful blue light from computer, phone and TV.
• ☀【High Quality Materials】The 3A transparent lens not only block 99% harmful blue ray (400-440nm), also with high transmittance (93%), providing a perfect balance between eye protection and visual experience. The lightweight and durable TR90 frame puts no stress on your nose ensuring comfort for long periods of time.
• ☀【Sleep Better】Prolonged exposure to blue light will slowing or stopping the production of melatonin, causing sleep disorders. FEIYOLD Blue Light Shield can stop it and provide you with a better night’s sleep

7- LifeArt Blue Light Blocking Glasses,Computer Reading Glasses 

• lue Blocker Lens: LifeArt lens can block harmful blue light, release your eye fatigue when watching TV and looking at computer. And provide you 100%UV400 protection.
• Reduce Eyestrain and Enjoy Better Sleep: no more eye fatigue, blurred vision and headache during your computer/ ipad/ tablet/ iphone screen time. Better sleep for you, blue light blocker is there for your eyes and guardian for your exquisite life.
• Transparent Lens(Not Tinted Yellow Lens): give you a clear vision when play computer and laptop.

8- MEETSUN Blue Light Blocking Glasses

• BLUE LIGHT FILTER LENS – Block harsh blue light and UV400,Blue light blocking computer glasses is Professional for people who work long hours on computers, tablets, games, on the phone or on TV
• ANTI EYE STRAIN, MORE RESTFUL SLEEP – Enjoy your digital time, NO worry about eye fatigue, blurred vision and headache., Improve Better Sleep, provide all-day protection
• TRANSPARENT LENS – Low color difference,bring you good visual experience,shock resistant ,non fragile and water proof, dust free and easy to clean,safe to wear