Blue Light Filter - Eye Shield

Protect your eyes from harsh late-night screen glare, OLED eye fatigue, and digital eye strain. Blue Light Filter - Eye Shield (TongBan) is a lightweight, 100% private on-device night screen dimmer, warm color temperature filter, and 20-20-20 eye break timer designed for comfortable night reading, web browsing, and long work sessions.

Even at 0% system brightness, modern phone displays emit high-energy blue light wavelengths that trigger dry eyes, evening headaches, and disrupted sleep cycles. Eye Shield applies a smooth, customizable warm amber overlay and sub-zero screen dimmer that softens your display below the default hardware minimum.

🌙 SMOOTH BLUE LIGHT FILTER & SUB-ZERO SCREEN DIMMER
• Adjustable Warm Color Temperature: Tune your display from subtle daylight warmth (3500K) to cozy amber paper tint (2700K) and deep night-vision red shift (1800K) to cut harsh blue light spectrum emission.
• Below-Minimum Extra Screen Dimmer: Lower screen brightness below Android's minimum brightness floor—ideal for reading e-books or scrolling in a dark bedroom, flight cabin, or nursery without disturbing others.
• Crisp Text & Zero Flicker: Softens harsh white backgrounds while keeping text sharp and readable across e-readers, browsers, comics, PDF documents, and social feeds.

📖 1-TAP COMFORT PRESETS FOR EVERY ENVIRONMENT
• Daily Comfort Mode: Balanced anti-glare warm filter that takes the edge off bright indoor office lighting.
• E-Book & Night Reading Mode: Gentle warm paper tint engineered to reduce squinting and visual fatigue during marathon reading sessions.
• Bedroom & Sleep Shield Mode: Deep blue light blocker paired with extra screen dimming to minimize evening glare before sleep.

⏱️ 20-20-20 DIGITAL EYE STRAIN BREAK TIMER
• Optometrist-Inspired 20-20-20 Rule: Every 20 minutes of continuous screen use, receive a gentle prompt to look 20 feet away for 20 seconds—helping your eye focusing muscles relax and reminding you to blink.
• Flexible Timer Controls: Start, pause, snooze, or customize your eye rest intervals in a single tap without losing your place in your book or app.

👩‍💻 WHO IS BLUE LIGHT FILTER - EYE SHIELD BUILT FOR?
• Night Readers & Book Lovers: Read novels, manga, and articles in bed without blinding white glare.
• Shift Workers & Late-Night Owls: Wind down after a night shift without harsh blue light keeping your brain wired.
• Light-Sensitive & Migraine-Prone Users: Instantly darken overly bright screens during headache or photophobia flare-ups.
• Students & Remote Workers: Combine warm screen filtering with 20-20-20 break reminders during long study blocks.

🔔 FOREGROUND SERVICE & NOTIFICATION BAR CONTROL (HOW IT WORKS)
To keep your blue light screen filter overlay active continuously across other apps and run your 20-20-20 eye break countdown reliably without Android interrupting the filter mid-use, Blue Light Filter - Eye Shield uses a user-initiated Foreground Service accompanied by a persistent status bar notification:
• User-Initiated & Perceptible: The foreground service runs only when you explicitly toggle on the screen filter or eye break timer.
• Instant 1-Tap Notification Controls: Pull down your notification shade at any time to switch presets, pause the filter, or stop and exit the service immediately.

🔒 100% PRIVATE, ON-DEVICE & BATTERY FRIENDLY
• Zero Screen Capture: Applies a pure color/dimming overlay—never reads, records, or captures your screen content, photos, or keystrokes.
• Completely Offline & Ad-Free: Requires no internet permission, no user accounts, no analytics tracking, and zero banner or pop-up ads.