![]() ![]() Who should wear blue light-blocking glasses One example of these lenses are Eyezen lenses. That might not sound like much, but most of the blue light these lenses block is in the high-energy violet-blue range (400 to 450 nm), which is the most likely to be damaging to the eye. The challenge for lens manufacturers and eye care professionals alike is that market research has shown people prefer to wear glasses with clear lenses rather than glasses with tinted lenses.īlue light-filtering glasses with clear lenses can block up to about 20% of blue light. This has many eye doctors and researchers concerned. How much blue light blocking is enough?Ĭurrently, there are no national or international standards concerning how much blue light should be blocked by “blue light glasses” for safety or comfort.īut because people today spend so much time in front of blue light-emitting screens of computers and phones, they are being exposed to significantly more blue light than previous generations. So eye care professionals usually must rely on technical marketing materials from lens manufacturers to determine how much blue light (and which wavelengths of blue light) are blocked by blue light glasses. ![]() Unfortunately, a laboratory-grade spectrophotometer is an expensive piece of equipment that’s not typically found in an eye doctor’s office or eyeglasses store. A lens or other optical sample is then placed in the machine, and a detector in the spectrometer determines the exact amount of a specific wavelength or range of wavelengths of blue light that is transmitted or blocked by the lens. The only proven way to accurately test blue light glasses is with an instrument called a spectrophotometer (also called a visible spectrometer).Ī simplified diagram of a spectrophotometer.Ī spectrophotometer in a laboratory instrument that splits light from a full-spectrum visible light source into its component wavelengths (usually in 10-nm increments). These online blue light tests might be useful to check if tinted lenses block nearly 100% of blue light, but they aren’t sensitive enough to measure the blue light-filtering capacity of clear (or only lightly-tinted) blue light glasses that most people prefer. You can find virtually anything on the internet - including easy at-home ways to test your blue light glasses. SEE RELATED: Should I buy blue light glasses for my kids? How blue light glasses are tested So, it’s actually more important to know what type of blue light your glasses are protecting you from, rather than the percentage of total blue light being filtered by them. It’s more important to protect your eyes from this highest-energy portion of the blue light spectrum - sometimes called violet-blue light - as this appears to be more potentially damaging to the eye than blue light with longer wavelengths (and less energy). Shorter-wavelength (400 to 450 nm) blue light has more energy than longer-wavelength (451 to 500 nm) blue light. ![]() ![]() The entire blue light spectrum includes HEV light with wavelengths ranging from 400 to 500 nm. The energy of visible light (including HEV blue light) is determined by its wavelength, which is measured in nanometers (nm). The term “blue light” encompasses a broad range of high-energy visible (HEV) light with different wavelengths and amounts of energy. Some blue light glasses with orange or other specialty tints can block nearly 100% blue light, but these lenses significantly affect your color vision as well.īut it’s important to know that all blue light is not equal. Generally, blue light glasses with clear lenses block up to 20% of blue light, while blue light glasses that have a yellow or amber tint tend to block more blue light than those with clear lenses. This article will help you make sense of what to look for and what to expect when shopping for blue light glasses. And there currently are no standards that say how much blue light these glasses should filter to keep your eyes comfortable and safe. By Adam Debrowski reviewed by Gary Heiting, ODīlue light blocking glasses can provide a big step toward reducing digital eye strain and improving your quality of sleep.īut different “ blue light glasses” block different amounts of blue light. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |