Choosing an eye gaze AAC device

An eye gaze AAC device lets a person build messages by looking at words, symbols or letters on a screen. A camera-based eye tracker works out where the eyes are pointed, and the system speaks the selected message aloud. The screen matters less than whether the tracker works reliably for this particular person, in the places they will use it, with software that matches how they communicate.

The short answer

Choose a device that meets four tests. It tracks the user's eyes accurately after calibration. It keeps working in their real seating positions and lighting. It runs a vocabulary system suited to their language and literacy. It can be funded, maintained and supported. The usual way to establish this is a formal AAC evaluation, typically led by a speech-language pathologist, followed by a hands-on trial of the actual hardware before anyone commits to buying.

Microphones play only a secondary role. An eye gaze system does not use a microphone to make selections: the eye tracker handles input, and the device's voice comes out through a speaker. A microphone matters for three things: video calls made from the device, recording a person's natural voice before their speech changes (voice or message banking), and any app feature that listens to a communication partner. Evaluate microphone and speaker separately, because a loud, clear speaker tells you nothing about how well the device captures sound.

A note on the evidence behind this guide

No model-specific specifications, prices, test results or availability information were supplied for this article, so it names no products and gives no figures. Manufacturer figures for tracking accuracy, battery life or speaker output are claims, not independently tested performance. Check them during a trial with the intended user.

How eye tracking works on AAC devices

Most dedicated eye gaze systems shine near-infrared light on the eyes. A camera then locates the pupil and the light's reflections, and the system maps the gaze to a point on the screen. The user selects an item in one of three ways: holding their gaze on it for a set time (dwell), blinking, or pressing a switch. Some software estimates gaze with an ordinary webcam instead. That can cost less, but it is generally less precise and more sensitive to lighting and head movement, so confirm it meets the user's needs before relying on it for everyday communication.

Tracking reliability for this user

Several things can affect how well a tracker locks on and stays locked: glasses or contact lenses, droopy eyelids, involuntary eye or head movements, differences between the two eyes, and visual impairments. During the trial, check how quickly the user can calibrate. Check whether the tracker can work from one eye if needed. See how it copes with reflections from lenses and whether it recovers after the user looks away or shifts position. Also look at whether target sizes, dwell time and selection feedback can be adjusted to match the user's accuracy and pace.

Positioning, mounting and lighting

Eye trackers work within a limited range of distance and angle, so the device must sit consistently in front of the user wherever they communicate: in a wheelchair, in bed, at a table. Confirm that the mounting options fit the user's chair and bed setups and can be adjusted by carers without tools or guesswork. Infrared tracking can struggle in strong sunlight and near some bright light sources. If the user spends time outdoors or by large windows, test it in those conditions rather than in a showroom or clinic.

Communication software and vocabulary

The software decides what the user can actually say and how quickly. Check whether it supports symbol-based vocabularies, text with word prediction, or both. Check whether it can grow with the user's language skills, and whether vocabulary pages can be edited easily by the people who support them. Ask whether vocabularies can be backed up and moved to a replacement device, and which languages and synthetic voices are available.

Alternative access methods

Eye gaze can be tiring, and the ability to use it may change with fatigue, illness or a progressive condition. A device that also supports touch, switch scanning or head tracking gives the user a fallback on difficult days and a path forward if their abilities change. Confirm which access methods the hardware and software support, and whether switching between them is simple.

Dedicated devices versus tablets with add-on trackers

Eye gaze AAC comes either as a dedicated speech-generating device or as a general-purpose computer or tablet paired with an eye tracker and AAC software. Dedicated devices are typically built for durability, mounting and communication-first use. General-purpose setups can offer broader access to apps, the web and email. Some funders require that a device be limited to communication, while others allow it to be unlocked for wider use. Find out the funder's rules before you settle on a configuration.

Audio: speaker playback and microphone capture

Speaker playback is how the device speaks. Check whether the voice is loud and intelligible enough for the places the user communicates, including noisy rooms. Check whether mounting points the speaker away from listeners, and whether an external speaker can be connected if needed.

Microphone capture matters most for video calls. Confirm that the device has a built-in microphone and camera, and that it supports the calling apps the user's family, clinicians or workplace use. Find out how the synthesized voice reaches the other person on the call. Some setups route the voice directly into the call audio. In others, the speaker plays it into the room and the microphone picks it up again. In that case, the calling app's echo cancellation or noise suppression may reduce, distort or cut off the device's voice. Only a real test call will show which happens.

Voice banking and message banking involve recording the person's own speech so it can be used on the device later. Recording quality depends heavily on the microphone and the room. A separate USB microphone used in a quiet, soft-furnished room tends to capture cleaner recordings than a laptop's or webcam's built-in microphone. Before starting, check what recording setup and file format the chosen banking service requires.

Support, repairs and training

An AAC device is the user's voice, so time without it is costly. Ask what the warranty covers, how repairs work, and whether a loaner device is provided during repairs. Ask how software updates are delivered and what training is available for the user, family, carers and school or care staff. Ongoing support from a speech-language pathologist familiar with the system often matters as much as the hardware.

Funding in the US

Medicare, Medicaid and many private insurers may cover speech-generating devices as durable medical equipment. Coverage generally depends on a documented evaluation and a prescription showing medical need. Requirements vary by plan and state, and funders may limit which devices or configurations they pay for. For students, a device may be provided through school services. No current prices or coverage details were supplied for this article, so confirm costs, approval steps and timelines directly with the funder and the vendor.

Checklist before you commit

• Has the user completed an AAC evaluation, ideally with a speech-language pathologist?
• Did the user trial the actual device and tracker, in their own seating and lighting, over more than one session?
• Does calibration work reliably with their glasses, eye movements and posture?
• Can dwell time, target size and feedback be adjusted to match their accuracy and fatigue?
• Are touch, switch or other access methods available as a fallback?
• Does the vocabulary software suit their current language and leave room to grow?
• Is the speaker loud and clear enough where they communicate?
• Does the device support the video calling apps they need, and has a real test call been made?
• If voice banking is planned, is a suitable microphone and quiet recording space ready?
• Are the warranty, repair turnaround, loaner policy and training clear?
• Have funding requirements, including any rules about locked or unlocked devices, been confirmed in writing?

Next step

Book an AAC evaluation, or ask the current clinician for one, and request trials of more than one eye gaze system so they can be compared in the user's real environment. Bring the checklist above to the trial, and test the microphone and speaker separately. Base the decision on how the user actually communicates during the trial, not on specification sheets.