Eye Tools & Calculators
Quick, private checks you can do at home to understand your eye health between clinic visits.
Choose a tool
3 tools for dry eyes and screen strain
Dry Eye Assessment (OSDI)
The Ocular Surface Disease Index (OSDI) is a clinically validated, 12-item questionnaire used by ophthalmologists and dry eye specialists worldwide. It measures how severe your dry eye symptoms are, what triggers them and how they affect your vision over the last week.
- 12 questions
- Instant score
Eye Blink Rate Calculator
Counts how often you blink using your device’s front camera, a key sign of dry eye and digital eye strain. It runs right in your browser on a laptop, tablet or phone, with no download, and no video is ever recorded or uploaded.
- Uses front camera
- Nothing recorded
Blink Break
Protect your eyes during long screen sessions. Blink Break reminds you to take a 20-second break every 20 minutes and guides you through the 20-20-20 rule recommended by eye care professionals.
- Every 20 minutes
- Free install
Easy on the eyes
A simple habit for screen users
The 20-20-20 rule
Every 20 minutes of screen time, look at something about 20 feet away for at least 20 seconds. It relaxes your focusing muscles and reminds you to blink.
Free to use
No payment, download or account needed.
Private by design
The blink test runs in your browser; no video leaves your device.
Made by eye specialists
Built by the team at Pristine Eye Hospitals, Hyderabad.
Symptoms bothering you?
These tools help you understand your eyes. For a diagnosis, see our dry eye specialists.
These tools are for general information and self-screening only and are not a substitute for a medical diagnosis. Please consult a qualified eye specialist about any symptoms.