Free Clinical Tools For Optometrists
ODReferenceOptometry Reference & Contact Lens Calculators
Popular Tools
Quick links to commonly used calculators and reference pages.
Contact Lens Calculator
Convert spectacle prescriptions to contact lens powers and spherical equivalent.
Plus/Minus Cylinder Converter
Transpose prescriptions between plus and minus cylinder formats.
Vertex Distance Calculator
Check vertexing correction for varying spectacle prescriptions.
Radius/Base Curve Converter
Convert between base curve radius (mm) and diopters (D) for contact lens fits.
RGP Lens Calculator
Support RGP fittings with base curve selection, power changes, and more.
Binocular Vision Norms
Reference vergence, phoria, and accommodative norms.
Designed for Real-World Optometric Practice
Tools and content structured to fit the way you actually work in clinic.
Clinical guides & parameter tables
Concise guides for contact lenses, medications, and key reference values built for quick chairside look-ups.
Purpose-built calculators
Tools for contact lens powers, cylinder transposition, vertex distance, RGP design, and more to streamline routine math.
Fast, intuitive navigation
Organized around contacts, medications, and reference so you can reach the right tool quickly during a busy clinic day.
Continuously maintained content
Updated as lenses launch, drug options change, and evidence-based ranges evolve so chairside info stays current.
Built by and for clinicians
Designed to mirror real-world workflows with clarity, practicality, and evidence-informed ranges you can trust.
Open access on any device
Use ODReference on desktop, tablet, or phone, without logins or paywalls slowing down patient care.
Used by Eye Care Professionals Worldwide
Quickly access trustworthy information and tools for everyday practice.
- Users
- 150k+
- Visitor Countries
- 150+
- Data Entries
- 500+
- Cost
- Free