Blue light filtering technology can be integrated into your prescription eyeglasses. These specialized lenses are designed to reduce the amount of high-energy visible (HEV) blue-violet light that reaches the eye. The primary purpose of this feature is to potentially alleviate symptoms associated with digital eye strain experienced from prolonged screen use.
The high prevalence of digital devices has driven the demand for this type of corrective lens. While the sun is the main source of blue light, digital screens also emit these wavelengths. The blue light filter is an optional modification that can be applied to nearly any single-vision, bifocal, or progressive prescription lens.
The Mechanics of Blue Light Filtration in Prescription Lenses
The implementation of blue light filtration relies on two manufacturing methods. The first uses a specialized anti-reflective coating applied to the lens surface. This coating works by reflecting or absorbing a portion of the blue light spectrum, particularly the shorter, higher-energy wavelengths.
Lenses with this coating often exhibit a faint blue or purple reflection when viewed from certain angles. They may also impart a subtle yellow or amber tint to the lens, depending on the specific wavelengths being filtered.
The second approach incorporates the filtering material, or pigment, directly into the lens monomer during manufacturing. This technique results in a more uniform filter throughout the lens material itself. Embedded pigments tend to offer a more cosmetically clear lens, potentially without the noticeable reflective glare seen with coated options.
While embedded filtering materials may provide a more seamless look, they can represent a higher premium cost compared to the applied coating. Both methods are effective at reducing the transmission of HEV blue light, but the specific percentage of light blocked varies between lens manufacturers and products.
How to Order Your Prescription Blue Light Glasses
Obtaining prescription eyeglasses with a blue light filter begins with a consultation with an eye care professional. During this visit, you should discuss your daily lifestyle, specifically the amount of time you spend using digital screens. This conversation helps determine if the added feature aligns with your visual needs and habits.
After your eye exam, the blue light filter is selected as an add-on option to your standard prescription, similar to scratch resistance or an anti-glare treatment. This selection process involves choosing between the surface coating or the embedded material, which will influence the final appearance and cost of the lenses. You will need to provide your prescription, whether it is for single vision or a more complex multifocal lens.
The addition of blue light filtering technology will incur an extra charge beyond the base price of the frames and prescription lenses. The final price can fluctuate based on the chosen filtration method, the complexity of your prescription, and whether you purchase through a private practice or a large optical retailer. It is advisable to check with your vision insurance provider to see if they offer coverage or a discount for this type of lens enhancement.
Scientific Consensus on Efficacy and Eye Health
Scientific research offers a nuanced perspective on the effectiveness of blue light filtering lenses, distinguishing between short-term comfort and long-term health. Regarding digital eye strain, studies have suggested that blue light-blocking glasses do not offer a benefit over standard lenses. Eye discomfort from screens is more often linked to reduced blinking rates and poor viewing habits rather than the blue light itself.
However, some people report a subjective improvement in visual comfort, potentially due to the lenses improving contrast or reducing glare. For those who experience light sensitivity or frequently use screens close to bedtime, filtering blue light may help regulate the body’s circadian rhythm. Blue light exposure in the evening can suppress melatonin production, making it harder to fall asleep.
When considering long-term eye health, the scientific consensus finds limited evidence that the amount of blue light emitted by digital devices causes age-related macular degeneration. Major organizations, including the American Academy of Ophthalmology, do not recommend special blue light glasses for computer use based on the lack of evidence of harm from digital screens.
Instead of relying solely on filters, eye care professionals often recommend behavioral changes. These include using the 20-20-20 rule: looking at an object 20 feet away for 20 seconds every 20 minutes to manage digital eye strain.