You can check whether your lenses filter blue light using a simple reflection test: hold the glasses under any artificial light and look at the front surface of the lens. If you see a blue-tinted reflection bouncing off the surface, the lenses have a blue light filter. A green or purple reflection instead means you’re looking at a standard anti-glare coating, not a blue light filter.
That reflection test is the quickest method, but it only works for one type of blue light lens. There are actually two different ways manufacturers build blue light filtering into glasses, and each one leaves a different visual clue.
Coated Lenses vs. Pigment-Infused Lenses
Blue light lenses fall into two categories, and knowing which type you have explains why they look different from each other.
The first type uses a reflective coating on the lens surface. This coating is engineered to bounce blue wavelengths away before they pass through the lens and reach your eyes. These lenses look almost perfectly clear when you wear them, but when you hold them under a light and look at the front surface, you’ll see that characteristic blue reflection. The coating works like a mirror tuned specifically to blue light.
The second type uses a pigment or dye embedded directly into the lens material. Instead of bouncing blue light away, these lenses absorb it. The pigment that absorbs blue light is yellow or amber, so these lenses carry a visible tint. Lenses with mild filtration have a very slight yellow tinge that’s barely noticeable. Lenses designed for heavier filtration, particularly orange or amber tinted glasses, can block up to 100% of blue light from screens, but the color shift is obvious.
Some newer lenses combine both approaches, using pigment embedded in the lens along with a surface coating, which lets manufacturers claim higher filtration percentages while keeping the visible tint minimal.
The Reflection Test, Step by Step
This works best for coated lenses. Hold your glasses about a foot away from your face with the front of the lenses facing a light source. A desk lamp, overhead fluorescent light, or even your phone’s flashlight will work. Tilt the lenses slightly until you can see light reflecting off the surface. Pay attention to the color of that reflection.
- Blue reflection: The lens has a blue light filtering coat.
- Green or purple reflection: The lens has a standard anti-reflective coating, which reduces glare but doesn’t specifically target blue light.
- No colored reflection at all: The lens has no specialty coating.
If your lenses have a yellow or amber tint instead of a blue reflection, they’re likely the pigment-infused type. You can confirm this by looking through them at a white screen. If white appears slightly warm or yellowish, the pigment is absorbing blue wavelengths.
The White Screen Test
Open a blank white document or a white webpage on your computer or phone. Look at the screen without your glasses first, then hold one lens between your eye and the screen. If the white background shifts toward a warmer, slightly yellow tone when viewed through the lens, the lens is filtering some blue light. The more pronounced the yellow shift, the more blue light is being blocked.
This test is less useful for lenses that rely purely on a reflective coating, since those lenses are designed to stay color-neutral. You might notice only the faintest warmth, or none at all. The reflection test is more reliable for coated lenses.
What the Filtration Percentages Mean
Not all blue light lenses filter the same amount. Some block as little as 10 to 20% of blue light wavelengths, while heavily tinted amber lenses can block nearly all of it. There’s no universal standard label for blue light filtration on everyday glasses. Unlike sunglasses, which must meet FDA safety standards for UV transmission, blue light glasses for computer use don’t have a required certification or standardized labeling system.
This means you often need to check the manufacturer’s website or packaging for the specific filtration percentage. Lenses that appear almost perfectly clear typically filter a lower percentage. Lenses with a noticeable yellow tint tend to filter more. Orange and amber lenses sit at the high end. If your glasses came without any filtration specs and you can’t find a blue reflection or a yellow tint, there’s a real chance they don’t have meaningful blue light filtering at all.
What Blue Light Lenses Actually Do for You
It’s worth knowing what you’re testing for. The American Academy of Ophthalmology does not recommend blue light blocking glasses for computer use, citing a lack of evidence that they reduce digital eye strain. Several studies have found that blue light filtering lenses don’t improve symptoms like tired eyes, headaches, or difficulty focusing after screen time. The fatigue most people feel after long screen sessions is more likely caused by reduced blinking, poor posture, and focusing at a fixed distance for hours, not by blue light itself.
That said, some people report subjective improvements in comfort or sleep quality when wearing blue light lenses in the evening, since blue wavelengths do play a role in regulating your sleep-wake cycle. If you already own a pair and want to verify they work as advertised, the reflection and screen tests above will confirm whether any filtering is present. Just keep your expectations grounded in what the evidence currently supports.