Follow the device manufacturer’s instructions to connect the device to iPad using Bluetooth, the Lightning connector, the USB-C connector, or the Thunderbolt / USB 4 connector (depending on your iPad model).
Go to Settings > Accessibility > Touch > AssistiveTouch, then turn on AssistiveTouch.
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To customize the eye-tracking device, tap Devices (below Pointer Devices), then tap the device.
To perform actions using a switch (if supported by your device), tap Customize Additional Buttons.
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Do any of the following:
Complete setup using the companion app for your eye-tracking device.