Screen Distance: Eye Care

Holding the phone too close is the habit nobody notices. Eye-care professionals recommend keeping screens at about arm's length, roughly 30 cm (12 in). Screen Distance turns that advice into something your phone does for you: it quietly checks how far the screen is from your eyes and dims it when you drift too close. Move back and it clears instantly.

HOW IT WORKS
• Every few seconds, while the screen is on, the front camera takes one tiny frame.
• On-device face detection measures the distance between your eyes and estimates how far the phone is.
• Closer than your limit for a few seconds? A soft dim layer appears with a gentle reminder.
• Back at a healthy distance? The screen is yours again, no tapping needed.

PRIVATE BY DESIGN
• Frames are analysed on the device and discarded immediately. Nothing is saved, shown or uploaded.
• The app has no internet permission at all, so nothing can leave your phone.
• No account, no sign-up, no ads, no tracking.
• The camera indicator blinks briefly during each check. That is Android confirming what the app does, and it cannot be hidden.

BUILT FOR BATTERY
• A check costs about a third of a second of camera time and happens only while the screen is on and unlocked.
• The rhythm adapts: relaxed when you are far, quicker when you get close, asleep when the phone is locked.
• Battery saver, low battery and a warm device slow it down automatically.
• Three modes: Battery saver, Balanced and Responsive.

FOR PARENTS
• Kids mode locks the settings and the stop button behind a PIN and removes the snooze button.
• Set your child's age so the distance estimate fits a smaller face.
• Daily and weekly reports show minutes spent too close and how the average distance changes.

MORE
• Choose your own alert distance (20 to 50 cm) and how long the app waits before dimming.
• 20-20-20 break reminders: every 20 minutes, look 6 m (20 ft) away for 20 seconds.
• One-time calibration for extra accuracy on any camera.
• A weekly eye report you can share.

PERMISSIONS
• Camera: to measure the distance. No photo is ever stored.
• Display over other apps: to dim the screen inside any app.
• Notifications: to show that protection is running and let you pause it.

Screen Distance is an ergonomics aid, not a medical device. It does not diagnose, treat or prevent any condition. For advice about your vision, talk to an eye-care professional.