BPPV Assistant

sensors —

Posterior canal BPPV

Strap the phone to the patient’s head. It guides the Dix-Hallpike, films the eyes for nystagmus, then steers each Epley position by head angle.

A clinical aid for trained examiners, not a diagnostic device. Recordings stay on this phone.

Side
Phone mount
Nystagmus
Safety screen

Avoid or modify positioning with: cervical spine instability, recent neck injury or surgery, severe cervical spondylosis or RA of the neck, vertebrobasilar or carotid disease, recent retinal detachment surgery, unstable cardiac disease, or inability to lie flat.

Motion sensors

Waiting for sensor data…

Eye camera

Place the phone in the headset with the front camera in line with both eyes. Check the framing before strapping it on.

Light mode · tap to show controls

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Rotate
Chin
Tilt

    Positions

    After the manoeuvre

    • Post-manoeuvre postural restrictions are not required (AAO-HNS 2017).
    • Reassess with Dix-Hallpike, now or at follow-up in about a month; repeat the Epley if still positive.
    • Warn about possible brief imbalance, and about falls risk in older patients.

    Positioning

    Guidance

    Headset mode

    Testing

    Mounting

    Headset (recommended): put the phone in a VR-style headset (Cardboard-type) with the screen facing the eyes. The front camera films the eyes, and the uniform screen light acts like Frenzel goggles by removing the fixation target. You follow voice prompts and beeps.

    Forehead: strap the phone to the forehead, screen facing out, so you can read the angle display. There is no eye video in this mode.

    Calibration

    Sit the patient on the couch facing its foot end, head straight, looking ahead. The app calibrates after 2–3 seconds of stillness. All target angles are measured from this pose, so the patient must lie back along the couch.

    Dix-Hallpike

    1. Turn the head 45° to the test side.
    2. Lie the patient back briskly with the head hanging about 20° below the couch. Recording starts as they go down; the time to reach position is noted.
    3. Observe (default 45 s), then sit up and watch for reversal.
    4. Review the video at slow speed. Tap Onset and End to measure latency and duration, choose the pattern, and the app suggests the side to treat.

    Without the camera

    Choose Nystagmus → Enter manually in setup, and watch the eyes yourself (Frenzel goggles or direct view). Use the forehead mount so you can see the screen. During the head-hanging observation, tap Onset and End and pick the pattern; latency and duration are worked out for you. Tap Reversal seen after sitting up. Enter findings only on the home screen records a test done without the app’s guidance.

    Epley

    Each position is reached when the head is within the angle tolerance. The hold timer only runs while the head stays there. Cues give the correction still needed, relative to the patient’s body: rotate left/right, chin up/down, tilt toward a shoulder.

    Reading the video

    The front camera shows the patient as you would see them facing them: the patient’s right eye is on the left of the image. Use the rotate button if the phone was mounted in landscape. Posterior canal BPPV gives upbeating nystagmus with the upper pole of the eye beating toward the lower (affected) ear.

    Accuracy

    Angles come from the phone’s gyroscope-based orientation fusion. Expect a few degrees of error, plus slow drift of rotation about the vertical over several minutes. Recalibrate if a session runs long.