Visual Acuity & Refractive Converter
Convert Snellen metric (6/6), Snellen Imperial (20/20), LogMAR, Decimal, and approximate dioptric refractive blur equivalent.
CVS-Q Validated Ergonomic Tool
Computer Vision Syndrome (CVS) & Digital Eye Strain Score
Quantify digital asthenopia, headache frequency, ocular fatigue, and accommodation lag from smartphone and computer monitor usage.
Interactive Clinical Assessment
Enter clinical parameters below for immediate computerized evaluation. Results update instantaneously.
Consultant Clinical Insight
"High-precision ophthalmic diagnostics and proactive screening prevent over 80% of preventable visual impairment. Early detection gives patients the greatest opportunity for spectacle freedom and retinal preservation."
Dr. Praveen Kumar
Consultant Cataract & Refractive Surgeon · Dr. Anil Kumar's Eye Hospital
Clinical Background & Evidence Base
Computer Vision Syndrome (CVS) affects up to 90% of individuals using digital visual displays for over 3 hours daily. The score evaluates blink rate reduction (normal 15–20/min drops to 5–7/min during screen focus), convergence fatigue, dry eye symptoms, and display illumination contrast, calculating an ergonomic burden index.
Clinical Staging Reference
| Classification / Stage | Clinical Interpretation & Care Pathway |
|---|---|
| Low Digital Strain (Score 0 – 5) | Healthy visual display habits. Continue following the 20-20-20 rule (every 20 minutes look at an object 20 feet away for 20 seconds). |
| Moderate Digital Fatigue (Score 6 – 12) | Mild accommodation lag and tear evaporation. Position monitor 20–28 inches away, below eye level; introduce lubricating artificial tears and blue-light anti-reflective lenses. |
| Significant Computer Vision Syndrome (Score 13 – 20) | High asthenopia burden with frequent tension headaches and blurred distance vision. Comprehensive binocular vision testing and ergonomic workplace assessment recommended. |