Understanding Infrared Technology and Biometric Recognition
Understanding Infrared Technology and Biometric Recognition
Most people think of cameras as devices that capture visible light—the same world we see with our eyes. But some modern sensing and biometric technologies can see more.
Certain biometric authentication and identity-recognition systems use infrared (IR) light, a form of light that is invisible to the human eye. IR technology can help compatible devices detect facial features, measure depth, and authenticate users—even in low-light conditions.
From unlocking smartphones to certain access-control applications, infrared has become an important component of some modern biometric systems.
But there's an important distinction: not all facial recognition relies on infrared. Many facial-recognition systems can analyze images captured by conventional visible-light cameras without using IR at all.
Understanding that distinction is an important part of understanding both infrared technology and its role in biometric identification.
What is Infrared Light?
Light Your Eyes Cannot See
Infrared radiation is a type of electromagnetic energy that exists just beyond the red portion of the visible spectrum.
While humans cannot see infrared wavelengths, infrared energy is all around us.
Sources of infrared energy include:
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The sun
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Electronic devices
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Buildings and pavement
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Vehicle surfaces
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The human body
Some infrared wavelengths are associated with the heat we feel from warm objects, while other IR wavelengths are used in sensing, imaging, communications, and biometric technologies.
Because infrared is invisible, most people rarely think about it. Yet it plays an important role in many technologies we use every day.
How Biometric Technologies Use Infrared
Some biometric systems use more than conventional visible-light cameras.
Depending on the technology, a system may use infrared illumination, IR cameras, structured light, depth sensors, or a combination of visible and infrared imaging to collect information about a user's face or eyes.
IR-dependent technologies can offer several advantages, including:
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Operation in low-light environments
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Consistent illumination independent of visible ambient light
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Depth sensing and facial mapping
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Detection of facial or ocular features used for authentication
For example, some consumer devices use infrared components as part of their facial-authentication systems. Apple's Face ID uses infrared technology as part of its TrueDepth camera system, while some Windows Hello-compatible devices also use IR cameras for facial authentication.
In these applications, infrared isn't simply taking a conventional photograph. It can be part of a specialized sensing system designed to collect information used to authenticate a user.
Not All Facial Recognition Uses Infrared
This distinction is important.
Conventional camera-based facial recognition can operate using visible-light images alone. A photograph or video captured by an ordinary camera may contain enough facial information for software to detect, analyze, or potentially identify a person.
As a result, infrared filtration should not be considered a universal method of blocking facial recognition.
Whether IR filtration affects a particular system depends on how that specific technology captures and analyzes information.
Why Infrared Matters for Privacy
In the past, digital privacy discussions focused heavily on passwords, personal information, browsing activity, and online tracking.
Today, biometric data is increasingly part of that conversation.
Facial authentication, fingerprint recognition, iris scanning, and other biometric technologies use physical characteristics as inputs for identification or authentication.
Unlike a password, many of those physical characteristics cannot simply be changed.
That doesn't make biometric technology inherently harmful. Biometric authentication can provide significant convenience and security. But understanding how these technologies operate can help consumers make more informed decisions about when and how they use them.
Infrared is one piece of that larger technology landscape.
Can IR-Filtering Eyewear Affect Biometric Technologies?
In some cases, it may.
The answer depends entirely on how the particular technology works.
Solir Optics lenses use passive optical filtration to block more than 90% of infrared light across the 780–2000 nm range. When eyewear filters IR wavelengths between an infrared source or sensor and portions of the wearer's face, it can potentially affect systems that depend on receiving that infrared information.
This means IR-filtering eyewear may interfere with the operation of certain IR-dependent biometric authentication or identity-recognition technologies.
However, this should not be confused with blocking facial recognition generally.
Solir Optics is not designed to prevent a person's face from being photographed, recorded, detected, or identified by conventional cameras or visible-light facial-recognition systems.
The eyewear does not make someone invisible or anonymous, and it should not be relied upon as protection against surveillance or identification.
How Solir Optics Manages Infrared Light
Most conventional sunglasses are designed primarily to manage ultraviolet and visible light.
Solir Optics takes a broader approach to light management by incorporating advanced infrared filtration alongside other lens technologies.
Features include:
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UV415 Protection
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Blue-Light Filtration
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Infrared Filtration
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Advanced Visible-Light Management
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Enhanced Color and Contrast
Solir Optics lenses filter more than 90% of infrared light across the 780-2000 nm range.
Because certain biometric technologies rely on infrared illumination or sensing, that IR filtration may also affect the operation of some IR-dependent systems.
Unlike electronic technologies, Solir Optics uses passive optical filtration.
There are:
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No batteries
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No software
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No connectivity
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No data collection
The technology is built directly into the lens.
FAQs
What is infrared light?
Infrared light is electromagnetic radiation with wavelengths beyond the visible red portion of the spectrum. Humans cannot see infrared light, but specialized cameras and sensors can detect it.
Do facial-recognition systems use infrared?
Some do, but not all.
Certain facial-authentication and biometric systems use infrared illumination, IR cameras, structured light, depth sensing, or other IR-dependent technologies.
Other facial-recognition systems can operate using images captured entirely with conventional visible-light cameras.
Can sunglasses block facial recognition?
Some do, but not all.
Certain facial-authentication and biometric systems use infrared illumination, IR cameras, structured light, depth sensing, or other IR-dependent technologies.
Other facial-recognition systems can operate using images captured entirely with conventional visible-light cameras.
Can sunglasses block facial recognition?
Sunglasses should not be assumed to block facial recognition.
Specialized IR-filtering lenses may affect certain systems that depend on infrared light. However, conventional cameras and visible-light facial-recognition systems can potentially photograph, detect, or identify a person while sunglasses are being worn.
Does Solir Optics block facial recognition?
Solir Optics should not be considered a general facial-recognition-blocking product.
Solir Optics filters infrared light, which may affect certain biometric authentication or identity-recognition technologies that depend on IR illumination or sensing.
Systems that use conventional visible-light cameras should not be assumed to be affected.
Does Solir Optics make you invisible or anonymous?
No.
Solir Optics does not make the wearer invisible or anonymous and is not designed to prevent photography, video recording, surveillance, facial detection, or identification.
Its IR filtration may affect certain technologies that specifically depend on infrared light.
Will Solir Optics affect Apple Face ID?
In Solir Optics' internal testing, Apple Face ID did not consistently unlock while Solir eyewear was worn. Face ID uses infrared-dependent technology as part of its authentication system.
Results may vary depending on the device, hardware, software version, eyewear position, lighting conditions, and other factors. Removing the eyewear may be necessary to authenticate using Face ID.
Understanding the Technology Starts With Understanding the Difference
Infrared light is invisible, but it plays an important role in many modern sensing and biometric technologies.
Some authentication and identity-recognition systems depend on infrared illumination or imaging. Others—including many conventional camera-based facial-recognition systems—can operate using visible light alone.
That distinction matters.
Solir Optics is designed to provide advanced light management, including filtration of more than 90% of infrared light across the 780-2000 nm range. That IR filtration may have the additional effect of interfering with certain IR-dependent technologies, but it should not be interpreted as general protection against facial recognition, surveillance, photography, or identification.
For consumers interested in advanced light protection and the technologies operating beyond the visible spectrum, understanding IR is a good place to start.
