Blue Light Control Lenses (An in-depth explanation)
Blue Control or Blue Block Lens
Before understanding blue light let us first understand what is light. Basically light is a stream of Photons (Smallest quantity of energy that can be measured) which have no mass and which travels at a speed of 3*108 miles per second. This stream of energy travels in a wave like pattern which is turn are made of oscillating magnetic electric fields carrying energy along with them. The white light that we see consists of oscillating waves of different wave lengths. Only the electromagnetic radiation ranging from 400 nm (Violet) to 700nm (Red) is what comes under the visible light. The wavelengths in visible light are shortest in the violet end (400nm), whereas they are longest at the red end (700nm).
White Light or Visible Light = VIBGYOR
All other electromagnetic radiations right from gamma rays (which have a very short wavelength of less than 10 picometers) to radio waves (which have longest wavelengths ranging from a few millimeters to thousands & thousands of kilometers) come under the invisible range and we cannot see it. (As depicted in picture above)
The electromagnetic radiation in the visible light which is towards the violet end of the spectrum consists of ultra violet light or ultra violet radiation and the electromagnetic radiation towards the red end is called infra red radiation. We see the sky as blue in the daytime because the shorter, smaller waves of blue light are scattered more than other colors. This effect is known as "Mie Scattering" similarly during dawn and dusk light travels a longer distance as compared to daytime and due to this a large amount of blue light and violet light has already been scattered and the light received by the observer is of a longer wavelength and therefore it appears to be red. This effect is known as "Rayleigh scattering".
UV Radiation:- Ultraviolet light radiation is the most harmful rays for our skin and eyes and it may cause permanent loss of vision or may be a cause for early age cataracts.
Ultraviolet radiations may be further classified into 3 categories UVA, UVB & UVC. Out of these UVC radiations are normally blocked by the Ozone layer covering our earth's atmosphere and so we are least exposed to it. Some amount of UVB and almost all of UVA reaches the earth.
Our eyes need a primary protection from the UVA radiations for which good opticians normally prescribe & dispense UV protective lenses. All spectacle wearers should opt for a UV protective lens instead of a normal lens because it protects our eyes from harmful UV radiation. Approximately one-third of all visible light in the VIBGYOR spectrum is high-energy blue light.
Stepping into sunlight, turning on your computer, phone or other digital device, are the main causes that expose your eyes to visible, and invisible light rays.
What Is Blue Light?
Now coming to Blue Light: Due to its shorter wave length the electromagnetic radiation which comes under the visible light spectrum first is Indigo and the Blue light. Blue light being shortest in wave length in the VIBGYOR spectrum flickers longer than the red light at the other end. This causes a significant reduction is visual contrast which is turn becomes the main reason for the eye strain, eye fatigue and dry eye conditions. A longer duration of exposure to such radiation ultimately leads to severe headache.
Normally there is a good enough proportion of Blue light in the sunlight too, but because we do not stare at such light for long duration it was never a cause of concern for human beings.
Blue light is also emitted from electronic devices having screens like computers, Television, Laptops, mobiles, and other electronic devices. Due to our modern life style we are getting more and more exposed to such radiations which in turn causes unprecedented visual disorders. Extreme levels of such exposures are said to be a cause for cell damages in our retina too. A damage to the central part of our retina which mainly comprises of cones and which is responsible for visualizing color can lead to permanent irreparable visual loss.
Nowadays we are getting increasingly exposed to this Blue light radiation and this is why we need to protect our eyes from these radiations. Millennials and Generation Z are extremely prone to these radiations and require special attention. Blue light filter or Blue block lenses are extremely efficient in cutting off these radiations.
But at the same time one needs to understand that some amount of Blue light is also essential for good health as it regulates the circadian rhythm in our body system which is responsible for our wake and sleep cycle. Circadian rhythm or circadian cycle, is a natural, internal process that regulates the sleep–wake cycle and repeats roughly every 24 hours. These 24-hour rhythms are driven by a circadian cycle and they have been widely observed in plants, animals, fungi , and cyanobacteria. Complete blockage of Blue light may cause disturbance in our wake and sleep cycle. This is where a good quality Blue light filter lens or a Blue block lens comes into play. Many world class companies manufacture quality Blue light filter lenses which allows essential blue light & blocks the harmful blue light, although they are a bit costly. Complete blockage of blue light affects our circadian rhythm.
The Effects of Blue Light Exposure:
Due to our modern life style we are getting more and more exposed to radiations emitting from various screens which in turn causes unprecedented visual disorders. Extreme levels of such exposures are said to be a cause for cell damages in our retina too. A damage to the central part of our retina which mainly comprises of cones and which is responsible for visualizing colour can lead to permanent & irreparable visual loss.
Blue light also plays an important role in causing eye strain. Because of its shorter wavelength, high energy blue light scatters more easily than any other visible light, and is not easily focused and stable. When someone is looking at the computer screen or any other digital device that emits significant amount of blue light, this unfocused, unstable visual “noise” reduces the contrast and contributes to red irritated eyes, digital eye strain, eye fatigue etc resulting in headache & blurry vision.
How can we Protect our eyes from Blue Light Exposure?
Blue light filter lenses or Protective computer glasses can very well shield your eyes against the harmful effects of blue light.
What Are Blue Control Lenses?
Blue control Coating is a filter built into optical lenses to neutralize the blue light emitted by LCD and LED screens, digital devices, fluorescent and LED lights. The filter helps prevent eye fatigue and eye strain. If you spend a lot of time in front of digital devices, blue control lenses provide more comfortable vision and better contrast perception.
Computer glasses are available without a prescription for persons having a 20/20 vision. They can also be tailored incorporating you power according to your prescription to suit your visual needs.
9 out of 10 Eye specialists recommend lenses and filters that protect your eyes from blue light. Ask the opticians at Better Vision about blue control lenses & they will explain in detail about it. Blue Control Lenses are scratch resistant, water, grease and dirt repellent, and Blue Control coating also neutralizes the high energy visible light emitted by LCD and LED screens. Blue Control Lenses filter the harmful portion of blue light while allowing the good portion of blue light to pass through. The reduction in screen brightness improves contrasts, flickering and eye fatigue gets reduced, vision is strain-free and eyes are protected.
The Benefits of Blue Control Lenses:
- Neutralize blue light, preventing eye strain and fatigue
- Reduce glare for a more comfortable and relaxed vision
- Reduce dry eyes, sticky eyes, and the feeling of grittiness or “sand” in the eye
- Enhance contrast perception offering a more natural color experience.
Ask us about the benefits of blue control lenses and our experts will be more than happy to assist you. We can offer blue control lenses for most prescriptions and the lenses can be fitted to most frames. We can work out which lens best suits your needs and best protects your eyes from blue light. If you would like to know more about Blue Control or have any questions, Simply add a comment below and we will get back to you.
i want to know about blue light contact lenses vs Blue Color Contact Lenses ?
First off all you should consult a eye doctor and check your eye power. If Your power is zero than you should lens of anti reflection with blue cut.
Everytime I sit in front of laptop my eyes pain. what to do?