Samsung Galaxy Tab S4 User Manual page 187

Settings
Unlocking the screen with your irises
You can unlock the screen with your irises instead of using a pattern, PIN, or password.
On the Settings screen, tap Biometrics and security → Iris Scanner.
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Unlock the screen using the preset screen lock method.
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Tap the Iris unlock switch to activate it.
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On the locked screen, swipe in any direction and position your eyes inside the circles on
the screen to scan your irises.
To unlock the screen using iris recognition, without swiping on the locked screen, tap Screen-
on iris recognition switch to activate it.
25-35 cm
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