Lucent: Reading Light Check
Light-adjusted eye break timer
$0.99 · Designed for iPad. Not verified for macOS.
Check reading light. Lucent estimates ambient light with your iPhone camera and adapts the break interval to changing light. No photos or videos are ever taken or saved.
Lucent helps you check the light where you read. Using your iPhone camera, it estimates ambient light and gives you a clear reading-light assessment. It also adjusts suggested break intervals as the light changes.
CHECK YOUR READING LIGHT
Point your iPhone toward your reading area. Lucent shows an estimated light level and tells you whether the conditions are suitable for reading.
BREAKS THAT RESPOND TO LIGHT
Light conditions shape Lucent’s suggested break interval. Start with a 20-minute baseline, then adjust it from 10 to 30 minutes in Settings. The schedule is Lucent’s own model, inspired by 20-20-20 and adjusted for ambient light. It is not a medical standard or medical advice.
KEEP A LOCAL RECORD
Review light samples over time and add notes for your desk, bedside, window, classroom, or outdoor reading. Gaps mean no measurement was taken; Lucent does not fill them in.
CAMERA, WITHOUT PHOTOS
Lucent processes camera data on your device while the app is open. It does not take or save photos or video. Your readings and notes stay on your device. Lucent has no account, ads, analytics, or network connection.
WHEN A LIGHT READING IS UNAVAILABLE
The timer still works from a fixed baseline if camera access is unavailable or your device cannot provide a light estimate. Lucent never guesses a reading.
Lucent estimates light; it is not a calibrated light meter. Its break suggestions are not a substitute for advice from an eye-care professional.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes and performance improvements.
The developer, 志杰 张, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 志杰 张
- Size
- 2.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.2 or later.
- iPhone
Requires iOS 26.2 or later. - iPad
Requires iPadOS 26.2 or later. - Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.2 or later.
- iPhone
- Languages
- English and Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 张志杰
