Blue light is all around us. Similarly to ultraviolet rays, blue light has the shortest wavelengths with the highest amount of energy. Blue light is produced by almost everything we engage with everyday, such as our TVs, phones, tablets, computers, fluorescent, and LED lights. These devices emit blue light which has both its benefits and potential health concerns. Our sun produces the most blue light - exposing electromagnetic radiation (EMR) to us when we are outdoors which can be beneficial to us. Ultraviolet rays (invisible light) from the sun is good in moderation, it promotes good health and prompts the body to produce vitamin D. However, UV rays can be harmful when we are exposed to it for too long, that’s why a tan can quickly develop into a painful sunburn, or worse, skin cancer. According to research, blue light exposure during the daytime may help cognitive function, elevate mood, help your memory, and alertness. However, the benefits of blue light seem to disappear at night. Blue light disrupts melatonin production your body releases naturally to help you fall asleep. Reading or watching shows on your screen before you fall asleep can negatively interact with your sleeping cycle which is why you may feel unrested when you wake up and fatigued throughout the day. Blue light blocking glasses are most effective for the night hours but may still be helpful during the day if you are exposed to computers and other devices for long periods of time.
For anyone, watching screens for hours on end can lead to eye-strain and potentially worse long-term effects. Blue light is absorbed all the way into the back of your eyes. Laboratory studies have shown that too much exposure can ultimately damage light-sensitive cells in your retina. This can cause changes that resemble those of macular degeneration, which may potentially lead to permanent vision loss. Although we need more research to determine the point at which man-made blue light exceeds a healthy limit, many health care providers are convinced that the added blue light from our devices can be more harmful than we are currently aware of. The evidence is clear enough right now that it is important to protect your eyes from long term damage. Which is why blue light blocking glasses with or without a prescription can help prevent those negative effects.