BLUE RAY[LIGHT]
Blue light is a colour in the "visible light spectrum" that can be seen by the human eye.
Light; It is made up of electromagnetic particles that travel in waves. These waves emit energy which differs based on range and strength. The shorter the wavelength, the higher amount of energy emitted. Every wavelength is represented by a different colour and is grouped into the following categories: gamma rays, x-rays, ultraviolet (UV) rays, visible light, infrared light, and radio waves.
However, the human eye is sensitive to only one part of this spectrum; "visible light". Visible light is that part of the electromagnetic spectrum that is seen as colours: violet, indigo, blue, green, yellow, orange and red [VIBGYOR].
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Blue light has a very short wavelength, and so produces a higher amount of energy. Studies suggest that, over time, exposure to the blue end of the light spectrum could cause serious long-term damage to your eyes.
Blue light has a wavelength of between approximately 380nm and 500nm; making it one of the shortest, highest-energy wavelengths.
SOURCES OF BLUE LIGHT:-
Blue light is actually everywhere. Sunlight is the main source of blue light, and being outdoors during daylight is where most of us get maximum exposure to blue light. The shorter, high energy blue wavelengths collide with the air molecules causing blue light to scatter everywhere. This is what makes the sky look blue. In its natural form, your body uses blue light from the sun to regulate your natural sleep and wake cycles. This is known as your circadian rhythm. But there are also many man-made, indoor sources of blue light, including fluorescent and LED lighting and flat-screen televisions.
What does BLUE LIGHT do?
As we know blue rays are shorter, these "Blue" or High Energy Visible (HEV) wavelengths flicker more easily than longer, weaker wavelengths. This kind of flickering creates a glare that can reduce visual contrast and affect sharpness and clarity.
This flickering and glaring may be one of the reasons for eyestrain, headaches, physical and mental fatigue caused by many hours sitting in front of a computer screen or other electronic device.
Anterior structures of the adult human eye (the cornea and lens) are very effective at blocking UV rays from reaching the light-sensitive retina at the back of the eyeball. In fact, less than one per cent of UV radiation from the sun reaches the retina, if you aren't wearing sunglasses.
On the other hand, virtually all visible blue light passes through the cornea and lens and reaches the retina.
Our eyes' natural filters do not provide sufficient protection against blue light rays from the sun, let alone the blue light emanating from these devices or from blue light emitted from fluorescent-light tubes. Prolonged exposure to blue light may cause retinal damage and contribute to age-related macular degeneration, which can lead to loss of vision.
How does blue light affect our BRAIN?
Light from electronic screens comes in all colours, but the blues are the worst. Blue light fools
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the brain into thinking it's daytime. When that happens, the body stops releasing a sleep hormone called melatonin. Melatonin is nature's way of helping us wind down and prepare for bed. Blue light exposure may increase the risk of macular degeneration.
Is all BLUE Light bad?
It's well documented that some blue light exposure is essential for good health. Research has shown that high-energy visible light boosts alertness, helps memory and cognitive function and elevates mood.
In fact, light therapy is used to treat seasonal affective disorder — which is a type of depression that's related to changes in seasons. Its symptoms usually begin in autumn and continue through winter. The light sources for this therapy emit a bright white light that contains a significant amount of HEV blue light rays.
Also, blue light is very important in regulating circadian rhythm — the body's natural wakefulness and sleep cycle.
Exposure to blue light during daytime hours helps maintain a healthful circadian rhythm. But too much blue light late at night (reading a novel on a tablet computer or e-reader at bedtime, for example) can disrupt this cycle, potentially causing sleepless nights and daytime fatigue.
PROTECTION AGAINST BLUE LIGHT:-
If you are using your phone constantly — especially if you use it primarily for texting, emailing and web browsing — a convenient way to reduce your blue light exposure is to use a blue light filter.
These filters are available for smartphones, tablets, and computer screens and prevent significant amounts of blue light emitted from these devices from reaching your eyes without affecting the visibility of the display. Some are made with thin tempered glass that also protects your device's screen from scratches. As mentioned above, computer glasses also can be helpful to reduce blue light exposure from computers and other digital devices.
We should eat fruits and vegetables enriched in VITAMIN A like PAPAYA, MANGO, SPINACH, CARROT, and many more
Also, several lens manufacturers have introduced special glare-reducing anti-reflective coatings that also block blue light from both natural sunlight and digital devices.
We should use Blue Light Blocking Glasses to protect us from blue light.
