WHAT IS BLUE LIGHT?
High-energy visible light (HEV light) is high-frequency, high-energy light in the violet/blue band from 400 to 450 nm in the visible spectrum. Blue light is one of the colours in the visible light spectrum that we can see with our eyes. Although blue light is marketed as 380 – 500 nm, the the actual harmful HEV light that is damaging to our eyes is between 380 – 420 nm.
Blue light is everywhere. It’s in fluorescent light, LED lights, smart phones, tablets, computers, flat screen TVs and more! In today’s digital age, we spend a lot of time in front of our devices. That is the reason why we must take preventative measures to protect our eyes.
WHY IS IT A CONCERN?
Blue light is extremely powerful. Almost all of it enters our eyes. From the front surface of our eye (the cornea), through the middle (the lens), all the way to the back (the retina).
Children are the most vulnerable to the effects because their lens are more transparent, making them more sensitive to than adults.
SHORT & LONG TERM HARMFUL EFFECTS
DIGITAL EYE STRAIN
Do you find that your eyes get sore or irritated, or that you have difficulty focusing on print after spending hours on the computer? This may be the effects of digital eye strain. Early research is suggests that too much blue light exposure can lead to eye strain, eye fatigue and headaches.
Studies have shown that continued blue light exposure may lead to damage of your photoreceptors (cells in your retina that are responsible for central vision and colour vision). Furthermore, certain wavelengths may cause age-related macular degeneration (an eye disease that causes you to lose your central vision).
When blue light enters the eye, the lens tries to absorb as much as it can, in order to protect the retina. When it does so, it becomes less transparent, leading to cataracts (lens opacity which leads to “cloudy” vision).
When you look at blue-light emitting devices such as computers, cell phones and tablets at night, your body produces less melatonin “the sleep hormone”. Over time, this leads to sleep problems due to the disruption to the circadian rhythm (the sleep-wake cycle).
Blue light may worsen your nearsightedness. Since it has a short wavelength, the focus is in front of the cornea, rather than at the center of the cornea. This can lead to nearsightedness as your eye grows longer to try to adapt.
Blue light also increases the production of free radicals causing cells in the cornea to die. When this happens, the eyes are often inflamed and dry.
What can you do to prevent these effects?
- Use a blue-light blocker like Zero Blue
- Limiting your screen time or taking frequent breaks to give your eyes some rest
- Using screen filters for your digital devices
- Using dim red light as your night lights since red light has the least effect on melatonin production
- Getting a blue-light filtering intraocular lens implant if you need cataract surgery to replace your natural lens
- Wearing orange or yellow tinted computer glasses
- Eating a healthy diet that is rich in fruits and vegetables to optimize the health of your retina
Want to learn more about our Zero Blue lenses? Give us a call or fill in the contact form.
416.915.1550 or 800.465.0048
Toronto, ON M1P 3A6
We operate 7 days a week.
Monday – Thursday
8:30 AM – 5:30 PM
8:30 AM – 4:30 PM
416.915.1550 or 800.465.0048