In the modern world, we spend lots of time looking at computer and video screens from very close distances. We also light our homes with the new energy-efficient lighting. Both of these sources give us exposure to light from the blue end of the spectrum. This is light that humans, in times past, did not get in such large amounts. In fact, before electric lighting, homes were dark at night and only lit by candles, the fireplace, and kerosene or whale oil lamps! Unfortunately, there are a few concerns related to the sources of bluelight that brighten our homes at night and provide entertainment and communication we have become accustomed to.
There is a type of cell in the back of the eye, on the retina, that is not there for vision. It is there to detect light in order to help us order our cycle of sleep and wakefulness. Humans have biologic mechanisms that regulate our circadian rhythms. These rhythms are biologic clocks that tell us, among other things, when to sleep and when to wake up. Basically, exposure to light tells our receptors that we need to wake up and stay awake. When the lights go out, these receptors tell us that it is time to sleep. There is, after all, a reason that you turn out the light when you want your child to sleep!
The key is that the cells called photosensitive retinal ganglion cells are especially sensitive to light from the blue end of the visual spectrum. Too much time watching video, tablets, cell phones and computer screens at close range increases blue light exposure beyond what is the human norm for the end of the day. There should be no surprise that people, and especially their kids, do not sleep well at night because their circadian rhythms are mixed up.
When we sit in front of a computer screen or use our smartphone, we blink less. This dries and irritates the eyes. The blue light from your device, being more powerful, is a big part of this. Reduce blue light exposure with Exigo Optical Eyewear and don’t forget to blink!
There are many causes of depression. However, one of them comes from a disrupted sleep cycle. There are complicated chains of events involving hormones, nerve impulses, and more that let us sleep and wake us up. One useful approach to dealing with a mixed up sleep cycle is to refrain from working on the computer or playing video games for the two to three hours before bedtime. And, consider using Exigo Optical Eyewear to reduce blue light glare which is a big contributor to sleep cycle disruption.
Blue light does not directly cause any of these problems. But, when excessive exposure to blue light disrupts the sleep cycle (circadian rhythm) there can be all sorts of side effects. One that has been demonstrated on test subjects is a higher blood sugar similar to early diabetes. Likewise, disrupted sleep cycles also affect the sense of feeling full after a meal so people become overweight and over the long term have an increased incidence of heart disease. A good approach to reducing blue light exposure is with Exigo Optical Eyewear.
Light waves on the blue end of the visible spectrum (red,orange, yellow, blue, indigo, violet for those who have forgotten Roy G. Biv) have the most energy. Because blue light passes through to the back of the eye, it can cause accumulated damage over the years. The end result can be macular degeneration. This damage at the center of the visual field results in blurred vision in the center of the visual field. This condition is most commonly seen in the elderly as they have had many years to damage their eyes with blue light exposure.
But, the elderly of today grew up listening to the radio and not watching television. They read the newspaper by an incandescent light bulb instead of the new and efficient lighting that is heavy on the blue end. They talked to each other on the front porch in the evening instead of working or entertaining themselves on a computer, video game console, or smartphone.
Today, many people work all day in front of their computer and then play video games in the evening or spend the evening looking up their friends on Facebook! And the amount of time spent in front of a video display screen increases as we move down into school-aged children.
The concern with blue light and with macular degeneration is that kids are starting to accumulate central visual field damage, little by little, at a much younger age than grandpa or grandma did. If the grandparents of these kids are having eye problems in their 70s and 80s, how much faster will the problem occur with children raised in the computer and video game era?
Luckily for children who love their video games, computers, and smartphones, there is a solution to reduce blue light exposure and still do what they enjoy. For optimal blue light protection, Exigo Optical Eyewear reduces blue light glare and the risks associated with accumulated blue light damage.
With the high-energy blue light that today’s digital devices emit, how can you protect your children’s eyes? Blue light blocking glasses are the key.
Energy processing parts of the retinal cell of the eye, called mitochondria, have been shown to be damaged by excessive blue light exposure like from digital screens.
There are several associations between excessive screen time and autism and none are good. Kids with autism need help with social skills and communication.
Blue light is high in energy. The truth about blue light is that it is essential to the waking and sleeping cycle but too much can cause problems.