Turn on Screen Distance in Screen Time on Mac
Viewing a device (or a book) too closely for an extended period of time can increase the risk of myopia for younger users and eye strain for users of all ages. The Screen Distance feature in Screen Time uses the TrueDepth camera (on supported models)—the same TrueDepth camera that powers Face ID—to detect when you hold an iPhone or iPad closer than 12 inches for an extended period, and encourages you to move it farther away.
Screen Distance can remind younger users to engage in healthy viewing habits that can lower their risk of myopia. It gives adult users the opportunity to reduce digital eyestrain.
Screen Distance is turned on by default for children under 13 (age varies by country or region) in a Family Sharing group.
Note: Screen Distance works only on your iPhone or iPad. When you turn on Screen Distance on your Mac, the setting applies to your iPhone or iPad that’s signed in to the same Apple Account. There are no alerts if you’re viewing your Mac too closely.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)If you’re a parent/guardian in a Family Sharing group, click the Family Member pop-up menu, then choose a family member.
If you don’t see the Family Member pop-up menu, make sure you’re signed in to your Apple Account and using Family Sharing.
Click Screen Distance, then turn it on.
When you hold the screen too close to your face for an extended period, Screen Distance covers the screen with an alert, preventing you from continuing. When you move your iPhone or iPad more than 12 inches away, you can tap Continue to resume using it.