Frequently Asked Questions

For individual patients, the tool is free to use. Simply visit the tool and measure your distance—no account or payment required.

For healthcare providers, clinics, and organizations interested in white-labeling, API integration, or custom implementations, see our Pricing or Contact.

We accept cryptocurrency payments in Bitcoin, Solana, XRP, and Ethereum.

The tool uses computer vision algorithms and machine learning models to measure the distance between your eyes (interpupillary distance) in pixels. During a quick calibration step, you extend your arm fully while touching the screen, which establishes a reference distance. The tool then measures your actual working distance over 7 seconds while you sit or stand normally at your computer.

All processing happens locally in your browser—no video is uploaded or stored. The measurement is calculated using mathematical models, calibration algorithms, and signal processing techniques.

The tool provides an estimate of your eye-to-screen distance, typically accurate within a few centimeters.

Accuracy depends on:

• Good lighting conditions
• Facing the camera directly
• Completing the calibration step correctly
• Stable camera position

This is an ergonomic estimate, not a medical measurement. For clinical purposes, share the results with your eye doctor.

Yes, absolutely. Privacy is our top priority:

• No video is uploaded: All processing happens locally in your browser
• No data storage: We don't collect, store, or transmit any personal information
• No tracking: No cookies or tracking scripts are used
• HIPAA compliant: The tool meets HIPAA requirements and doesn't collect patient health information

Your results are generated entirely on your device. You can share them with your doctor if you choose, but we never see or store them.

The tool is available in English, Spanish, French, Portuguese, and German, with more languages coming soon.

If you're a healthcare provider or organization needing a specific language, please contact us to discuss priority language support for your region. Contact

Best experience: Desktop or laptop computer with a webcam

Supported browsers: Chrome/Edge (recommended), Firefox, Safari, Opera

• Chrome/Edge (Take Distance Test)
• Firefox
• Safari (macOS and iOS)
• Opera

Mobile devices: While the tool works on phones and tablets, we recommend using a desktop or laptop at your actual computer for the most accurate measurement. Mobile users can use manual mode.

Requirements: Camera access, HTTPS connection (or localhost for development), and JavaScript enabled.

No problem! The tool includes a Manual Mode that allows you to enter your estimated screen distance directly.

If you have a webcam but it's not working:

• Check browser permissions—make sure camera access is allowed
• Try a different browser
• Ensure no other applications are using the camera
• Check that you're on HTTPS (required for camera access on most browsers)

If you encounter issues, try these troubleshooting steps:

• Better lighting: Ensure your face is well-lit and the camera can see you clearly
• Face the camera: Look directly at the screen/camera
• Remove glasses: If your glasses have reflective lenses, try removing them temporarily
• Move closer: Sit closer to the camera if facial landmarks aren't being detected properly
• Use manual mode: If webcam mode continues to fail, use manual mode to enter your distance

If problems persist, the manual mode is always available as a reliable alternative.

We offer several integration options:

• White-labeled embedding: Embed the tool directly on your practice website with your logo and branding
• Standalone page: Link to a dedicated page on your website
• API integration: Connect directly to your practice management system via HIPAA-compliant API
• Email workflow: Patients can email results directly to your office

Eye Doctors Email workflow: Patients can email results directly to your office Contact

Yes! We offer a HIPAA-compliant API that allows results to flow automatically into patient records.

API features include:

• Automatic patient record updates
• Secure authentication and authorization
• End-to-end encrypted data transmission
• Customizable data formats
• Real-time webhook integration for instant notifications

Contact Real-time webhook integration for instant notifications

No. This tool provides an ergonomic estimate of your screen distance. It is not a medical diagnosis, prescription, or substitute for a professional eye examination.

The results are intended to help your eye doctor understand your working distance so they can prescribe lenses optimized for that distance. Always consult with a licensed eye care professional for medical advice, diagnosis, and treatment.

Yes. Our platform is HIPAA compliant and we maintain a Business Associate Agreement (BAA) with our cloud provider. However, it's important to understand that our service does not collect, store, or process patient health information (PHI).

All processing happens locally in the user's browser. The tool generates a non-identifying, non-diagnostic ergonomic estimate. We do not collect or store any patient data, ensuring complete privacy and HIPAA compliance.

After completing the measurement, you have several options to share your results:

• Email: Click the "Email Results" button to send results directly to your doctor's office
• Download: Download the results as a PNG image to save or print
• Screenshot: Take a screenshot of the results page
• Show on phone: Complete the test on your computer, then show the results on your phone during your appointment

Results include your average distance, typical range, and percentage of time spent at different distances—all the information your doctor needs to optimize your prescription.