Digital Myopia Checker and Visual Acuity Estimator

VisionMatrix AI

Developed by Ir. MD Nursyazwi

The next generation of digital eye screening. Our clinical-grade engine uses advanced spatial mapping to determine your visual acuity and estimated spherical correction instantly.

Optical Testing Protocol

Phase 01 Display Calibration

Place any standard credit card against your screen. Adjust the slider until the digital box matches the physical card size perfectly.

Phase 02 Distance Selection

Choose Handheld (40cm) for mobile use or Standard (200cm) for a professional room-scale test. Ensure proper lighting.

Phase 03 Visual Mapping

Cover your left eye first. Identify the randomized letters. Repeat for the right eye to get a complete myopia profile.

Select Test Environment

Please select a testing mode to begin calibration.

Hardware Calibration

MATCH BOX TO PHYSICAL CARD

SEQUENCE: 1/12 --

E

Analysis Complete

Metric (Snellen)--

Imperial (Snellen)--

Estimated Myopia Severity

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The Science Behind VisionMatrix AI

Understanding Digital Refraction

VisionMatrix AI operates on the principles of Snellen Chart Dynamics translated for modern display technology. Unlike static paper charts, our tool utilizes a Spatial Calibration Engine. By matching the calibration box to a physical reference (like a credit card), the algorithm calculates your screen's exact pixels-per-inch (PPI). This ensures that the optotypes (letters) displayed are precisely sized to subtend an angle of 5 arcminutes at your specified testing distance—the clinical requirement for accurate acuity measurement.

From Acuity to Spherical Equivalent

The conversion from Snellen scores (e.g., 20/40) to Diopters (spherical degree) is based on the LogMAR Scale (Logarithm of the Minimum Angle of Resolution). Our backend logic analyzes your error rate across 12 randomized sequences to compute a precise LogMAR value. We then apply a verified regression formula to estimate the Spherical Equivalent (SPH), providing an indicative measure of myopia severity. This method is highly effective for preliminary screening and monitoring vision changes over time.

Commitment to Accuracy and Ethics

Developed by Ir. MD Nursyazwi, this tool emphasizes user privacy and scientific integrity. No data is stored or transmitted; all calculations occur locally in your browser. While VisionMatrix AI provides high-precision estimates, it is designed to complement—not replace—professional comprehensive eye exams. Regular visits to an optometrist are essential for assessing ocular health beyond simple refractive errors.