How It Works
1
Calibration
First, calibrate your screen size and viewing distance using a credit card and your device camera.
2
Test Your Vision
Read Sloan letters presented at different sizes. The test uses a 1-up/1-down staircase to find your visual acuity threshold.
3
Review Results
See your Snellen fraction (e.g., 20/20) and logMAR score. Results are saved locally for tracking trends over time.
Before You Start
- ✓Test one eye at a time by covering the other eye
- ✓Find a well-lit area with minimal glare on your screen
- ✓Have a credit card ready for screen calibration
- ✓Allow camera access for distance calibration (optional)
- ✓Wear your glasses or contacts if you normally use them
Note: This is a screening tool only. Results should not replace professional eye examinations. Consult an eye care professional for comprehensive evaluation.