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.

That's what I love about geeks, that they can call themselves a geek and be proud of it. I love that. I even have a necklace with the word 'geek' spelled out in rhinestones, and I'm very proud, myself.

I always say God doesn't need me, but I need Him in my life to survive in this world and over temptation. That's Who keeps me humble every time.

I think music needs danger; it needs risk.

My fear was not of death itself, but a death without meaning.

I'm lucky with my skin - it doesn't require a lot of attention, so I keep things simple. And I drink a lot of water.

Love proves itself by deeds, so how am I to show my love? Great deeds are forbidden me. The only way I can prove my love is by scattering flowers, and these flowers are every little sacrifice, every glance and word, and the doing of the least actions for love.

Anything from 1-0 to 2-0 would be a nice result.

I love improvising on the spot. I like that pressure.

To hate, to love, to think, to feel, to see; all this is nothing but to perceive.

The orchestration of press, radio and television to create a continuous, lasting and total environment renders the influence of propaganda virtually unnoticed precisely because it creates a constant environment.

If you value your wins and you value what you've done over the course of your career, then you wouldn't want people harboring over a loss, even though you fought extremely well.

Feminism is not just about women its about letting all people lead fuller lives.

I was a pretty difficult teenager.

Different strokes for different folks.

Musicians make up for the copies of their songs that get pirated by performing live. I don't think there will be as many people showing up to hear me read as to hear Beyonce sing. We need to make sure piracy is dealt with effectively.

Other people like Neil Young and Dennis Hopper, those are just really close knit family friends.

I always knew I wanted to have children.

I've won several Emmys, a Tony and a Grammy, so maybe somebody will let me have an Oscar, and then I'll have a full set.

I am keen to maintain very good relations and develop the relationship with the United States.

Some anti-Americanism derives simply from our being a colossus that bestrides the earth. But much anti-Americanism derives from the role U.S. political, economic and military power has played in denying such freedoms to others.

I just sort of follow my bliss, so to speak, and then I see where that takes me.

We need women who are at the head of a boardroom, like at the head of the White House, at the head of kind of major scientific enterprises so that little girls everywhere can then think, you know what? I can do that, I want to do that, I will do that.

I don't plan to go out and do action or not do action.

There are so many scenarios here. We tried to prepare for the worst summer in 40 years and build assumptions based on that. We're preparing for the worst, but we're hoping for the best. And I've told people the end is in sight.