Harmful effects of blue light
Before knowing how to choose anti-blue light lenses, we must know what blue light is. Blue light is light originating from sunlight and electronic devices, including countless monochromatic light with short wavelength characteristics of 380-500nm and high energy.
Blue light has a green light and blue-violet light. According to studies, blue light causes many harmful effects to the eyes, including the following:
Increased risk of refractive errors such as nearsightedness and astigmatism.
Causes dry eyes, eye fatigue, blurred vision, and blurred colors if exposed for a long time.
Causes corneal clouding, increasing the risk of macular degeneration.
Increased risk of vision loss and even blindness.
Not only that, many scientists warn that exposure to blue light can cause circadian rhythm disorders, so the body is susceptible to insomnia and prolonged fatigue, affecting health. Therefore, experts advise people not to be exposed to blue light for a long time and at high intensity.
What are anti-blue light lenses?
Blue light is harmful, but because you work on a computer or look at your phone, you cannot avoid being exposed to it. Therefore, anti-blue light lenses were born to help prevent the harmful effects of blue light on the eyes of those who have to work and are exposed regularly.
How to choose the right blue light lenses
Anti-blue light lenses are divided into two main types: those with and without degrees. Depending on the eye condition, customers have different choices.
For zero-degree anti-blue light lenses
This type of lens is used for people with normal vision without refractive errors but must regularly work, study, and be exposed to blue light to prevent its harmful effects. This lens will be made from materials that do not require discounting, mainly ensuring transparency, image, and color standards when worn.
Normally blue light-proof lenses are made from materials such as Colombia Resin 39 plastic and polycarbonate plastic. These materials all ensure image accuracy, light color, and durability. However, Colombia Resin 39 is cheaper and easily yellows after use.
Meanwhile, Polycarbonate plastic also has UV protection when working outdoors, and is more durable and transparent over time.
For anti-blue light lenses with degrees
This is a lens for people with nearsightedness, astigmatism, farsightedness, and presbyopia. This lens requires the refractive index of the material to ensure the ability to see objects clearly when worn, by the principle of improving the refractive error of the lens.
Materials for this type of lens include High Index Polycarbonate, Korean Monomer, NK55… Priority is given to high index materials to make them thinner and lighter when worn, even at high nearsightedness/astigmatism/farsightedness, it will not affect them too much to the thickness of the glass.
In addition to the anti-blue light feature, you should choose lenses with additional coatings to prevent UV rays, reflectivity, water vapor, limit scratches, limit dust… to bring comfort and convenience highest for people wearing glasses.
Be careful when wearing blue light-blocking glasses
Anti-blue light lenses help protect the eyes but are not absolute. In addition to wearing glasses, you should also practice eye relaxation, eye massage and rest in moderation to avoid affecting vision and eye health as well as increase nutrients and vitamin A to help brighten your eyes.
When wearing anti-blue light glasses, you should occasionally remove them and let your eyes relax, avoiding relying too much on glasses, especially when at low nearsightedness. In addition, wearing glasses will be more effective if you have the correct sitting posture.