How to enable Screen Distance feature on your iPhone to protect your eyes

Holding your smartphone close to your eyes can harm eyes. Not only are the kids at risk due to this, but even adults can suffer eye fatigue if viewing a phone too closely. Therefore, it is important to maintain a safe viewing distance and that’s why Apple iPhone’s Screen Distance feature comes in handy.
Apple says the Screen Distance feature uses your iPhone’s TrueDepth camera to detect when you hold your iPhone closer than 30 cm (12 inches) for an extended period, and encourages you to move it further away.