Long exposure to blue light may have been responsible for your symptoms. Blue light lowers the contrast on screens, causing the condition. Other factors that can contribute to eyestrain include poor lighting, failing to take regular breaks, less frequent blinking and dry air.

Blue Light is the specific section of the visible light spectrum that can have harmful effects to our eyes and sleep.

Artificial blue light is emitted from LED lighting and from digital devices. Our close proximity to the device when viewing, especially over long periods of time, means that the harmful blue light can affect us and our children’s wellbeing.

The rays of the sun may appear to be colorless, but they're actually made up of red, blue, orange, yellow, green and violet hues. Red and orange are located at one end of the visible light spectrum, while blue and violet are at the other.

Red rays have long wavelengths, but produce less energy. At the other end of the spectrum, the wavelengths are shorter, but the energy is stronger. Because blue rays emit higher amounts of energy, they're more likely to affect your eyes.

Most of your exposure to blue light comes from the sun, but you can't avoid exposure simply by staying indoors. In addition to computer monitors and smartphones, blue light is produced by tablets, LED and fluorescent lights, LED light from TVs and compact fluorescent light bulbs.

Although blue light plays an important role in maintaining the sleep/wake cycle, regulating your mood and keeping your memory sharp, it may harm your eyes.

Long-term exposure to blue light may increase your risk of developing age-related macular degeneration (AMD). AMD occurs when the macula, the area of the retina responsible for central vision, is damaged.

It is known that light exposure suppresses melatonin secretion. Melatonin is a hormone which can influence circadian rhythms. Lower melatonin levels may explain the preliminary evidence of links to cancer.

Fluorescent light bulbs and LED lights do provide more energy efficiency than traditional incandescent bulbs. They also give off more blue light. Incandescent lights do produce some blue light, although less than most of the fluorescent light bulbs available.

During the two to three hours right before bed, avoid viewing bright screens.

Wear blue-blocking glasses or download an app to filter blue and green wavelength at night. This will help those that need to use electronic devices at night and individuals working night shifts.

Red light has the least influence on the circadian rhythm. Consider using dim red lights in bedrooms.

Add screen filters to computer screens, tablets and smart phones to reduce blue light emissions.

Use computer glasses that have yellow-tinted lenses that increase contrast and help block blue light.

Wear anti-reflective lenses to block blue light from digital devices and the sun.

Consider choosing an Intraocular lens (IOL) that protects eyes from blue light. This will replace a cloudy lens during cataract surgery.

For children, especially from birth to age three, the crystal lenses in their eyes are not fully developed. So it goes straight through, it causes a lot more damage in children’s eyes than it does in adults.

Blue light does affect the body’s circadian rhythm, our natural wake and sleep cycle. During the day, blue light wakes us up and stimulates us. But too much blue light exposure late at night from your phone, tablet or computer can make it harder to get to sleep.

Blue light from computer screens and digital devices can decrease contrast leading to digital eyestrain. Fatigue, dry eyes, bad lighting, or how you sit in front of the computer can cause eyestrain. Symptoms of eyestrain include sore or irritated eyes and difficulty focusing.

Studies suggest that continued exposure to blue light over time could lead to damaged retinal cells. This can cause vision problems like age-related macular degeneration.

After cataract surgery, the cloudy lens will be replaced with an intraocular lens (IOL). The lens naturally protects the eye from almost all ultraviolet light and some blue light. There are types of IOL that can protect the eye and retina from blue light.

Screen filters are available for smart phones, tablets, and computer screens. They decrease the amount of blue light given off from these devices that could reach the retina in our eyes.

'Political junkies' and liberals will watch MSNBC, and angry, old right-wingers will watch Fox.

If you even dream of beating me, you'd better wake up and apologize

Paradise is open to all kind hearts.

There are examples of ex-presidents speaking out. Jimmy Carter has not held back on a variety of issues. Harry Truman didn't.

I won't lie - when you're first bringing out music and you want people to notice, you probably overdo it, especially as a girl.

Well, Tommy Lee Jones is a little bit more intimidating. He's definitely a cowboy. He's from Texas.

Toby not being there doesn't bother me, I mean I can work with anybody as long as we get along and as long as they've got an understanding of what I want and what I'm aiming for. To start with, when he left, it was difficult.

Nothing is so good that impious and sacrilegious and wicked people cannot contort its proper benefit into evil.

Hip-hop was my first audience - I would rap in the mirror, walk down the street and listen to my Walkman.

It's a Renaissance, or put more simply, some you win, some you lose.

People say 'what do you mean' when you talk about 'bringing down civilization.' What I really mean is depriving the rich of the ability to steal from the poor and depriving the powerful of the ability to destroy the planet. That's what I really mean.

I was right to back Muhammad Ali, but it caused me major enmity in many areas of this nation.

I have fantastic ideas.

The day of birth is a sacred day.

The downside of being a celebrity is that people kind of know about you, and you really don't need them to know about you - you need them to know about your work.

A social problem is one that concerns the way in which people live together in one society. A racial problem is a problem which confronts two different races who live in two separate societies, even if those societies are side by side.

No sensible person ever made an apology.

We don't believe we've solved the multicore-programming problem. But we think we've built an environment in which a certain class of problems can take advantage of the multicore architecture.

Solar power seems to be truly bipartisan in its appeal.

I accept the fact that some things don't go the way you hope.

Silence is the bluntest of blunt instruments.

Milk is a really important part of my diet. For London, I had to be in the best shape of my life, and having milk every day played a part in that.

All around us is the cosmic game, the cosmic play. The universe is full of joy, inner and outer. When realisation takes place, we have to feel the necessity of manifesting this constant delight in our heart. The delight glows, but does not burn. It has tremendous intensity, but it is all softness and absolutely sweet-flowing nectar.

Be patient. Like storms, the challenges will pass. Know too, that like the sun, your true soul self is constantly radiating.