Visual Acuity & Refractive Converter
Convert Snellen metric (6/6), Snellen Imperial (20/20), LogMAR, Decimal, and approximate dioptric refractive blur equivalent.
TFOS DEWS II Clinical Scale
Dry Eye Ocular Surface Disease Index (OSDI)
Evaluate eye dryness, stinging, grittiness, sensitivity to light, and visual blur during reading or screen use using the validated 12-item OSDI 100-point scale.
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. R. K. Rasmi Praveen
Paediatric & Ocular Surface Specialist · Dr. Anil Kumar's Eye Hospital
Clinical Background & Evidence Base
The Ocular Surface Disease Index (OSDI) is a 12-item validated questionnaire assessing dry eye frequency, environmental triggers (wind, air conditioning), and vision-related limitations. Score = (Sum of question scores * 25) / (Number of questions answered). Scores range from 0 to 100, stratified according to the Tear Film & Ocular Surface Society (TFOS DEWS II) consensus.
Clinical Staging Reference
| Classification / Stage | Clinical Interpretation & Care Pathway |
|---|---|
| Normal Ocular Surface (OSDI 0 – 12) | Healthy tear film stability and lipid layer. Maintain routine eyelid hygiene and hydration. |
| Mild Dry Eye (OSDI 13 – 22) | Episodic irritation or environmental strain. Preservative-free lubricating eye drops (carboxymethylcellulose or sodium hyaluronate) and warm compresses recommended. |
| Moderate Dry Eye Disease (OSDI 23 – 32) | Persistent burning, foreign body sensation, and fluctuant vision. Clinical tear breakup time (TBUT), meibomian gland expression, and lipid-based drops advised. |
| Severe Ocular Surface Disease (OSDI 33 – 100) | Disabling ocular discomfort and corneal epitheliopathy. Requires specialist therapy including topical cyclosporine, punctal plugs, or therapeutic scleral lenses. |