With the popularity of electronic devices such as mobile phones, computers and LED screens, we are exposed to blue light on an almost daily basis, and blue light has become an important factor in the health of our eyes. So what exactly is blue light? How does it affect our eye health? And how can we effectively protect ourselves from it? Today we are going to discuss these questions, which are closely related to our eye health, one by one.
What is blue light?
Blue light is light in the spectrum with wavelengths between 400-460nm and is part of the light that is visible to the human eye. It is present not only in natural light, such as daylight, but also in the screens of electronic products used in everyday life. Due to its high energy properties, blue light is able to penetrate the cornea and lens and reach the retina, which can cause some damage to the eyes.
Harmful effects of blue light on the eyes
Visual fatigue: Prolonged exposure to blue light, especially from electronic screens, can easily lead to excessive eye fatigue. The wavelength of blue light is short and the focal point is not in the centre of the retina, which puts the eyeballs in a state of tension for long periods of time, causing visual fatigue.
Short-sightedness: Blue light can damage the tissue structure of the eye and affect the refractive state, leading to nearsightedness. Prolonged exposure to blue light weakens the eye's ability to regulate itself, increasing the risk of myopia.
Cataracts: Exposure to blue light can cause cloudiness of the lens and the gradual formation of cataracts. The lens absorbs some of the blue light, which can lead to cataracts and other eye diseases after long-term accumulation.
Macular degeneration: The high energy of blue light can damage retinal nerve cells, leading to macular degeneration. Damage to the macula, the central area of the retina responsible for fine and colour vision, will seriously affect vision.
Blue light glasses
Anti-blue light glasses can effectively reduce the damage caused to the eyes by blue light. When choosing blue light glasses, you should consider the following to ensure that you choose a product that is both suitable for you and provides good protection:
Lens quality and performance
Anti-blue light rate: When choosing blue light glasses, look at their anti-blue light rate. Generally speaking, the blue light reduction rate must be greater than 40% to effectively filter out harmful blue light.
Transmittance: Transmittance is also an important indicator to ensure that vision is clear when worn and does not interfere with the normal visual experience.
Chromatic Aberration: Chromatic aberration should be as low as possible to avoid problems such as colour distortion after wearing.
Comfort and fit
Frame shape: Make sure the frame fits your face and ear shape, and is comfortable and stable to avoid discomfort after prolonged wear.
Weight of glasses: Lighter lenses and frames reduce strain on your nose and ears and improve comfort.
Brand
Try to buy from reputable brands and retailers. These brands usually have a stricter quality control system and better after-sales service, which can ensure that you are buying a reliable product.
In addition to blue light glasses
Use electronic devices wisely: Follow the "20-20-20" rule - for every 20 minutes you use your eyes, look 20 feet (about 6 metres) away for 20 seconds. This will help reduce eye strain. Also, minimise the time you spend using electronic devices, especially before bedtime.
Adjust screen settings: Adjust the screen brightness of your electronic devices to a comfortable level, avoiding settings that are too bright or too dark. Also, use eye care mode or warm-coloured screens to reduce blue light.
Increase outdoor activities: Blue light from natural light can be beneficial to the eyes, especially for children. Increasing the amount of time spent outdoors can help promote eye development and vision health.
Maintain a healthy lifestyle: Eat a balanced diet rich in vitamins and antioxidant-rich foods such as carrots, spinach and blueberries. These foods help protect the eyes from harmful rays such as blue light.
Considering blue light protection is a positive step towards keeping your eyes healthy and protecting your vision. Prevent blue light damage to your eyes in your daily life by wearing blue light glasses so you can enjoy a better life with clear vision.
