ODAtlas

A fast contact lens reference for eye care practitioners

ODAtlas is a free quick-reference tool for optometrists, opticians, contact lens technicians and students. It brings the everyday numbers of contact lens practice into one place: side-by-side specifications from the major manufacturers, chairside calculators for vertex conversion, cylinder transposition and radius/dioptre conversion, and a lookup for common ophthalmic medications. Everything is built to load fast and be readable at a glance during a busy clinic.

The tables above compare products from Alcon, Bausch + Lomb, CooperVision and Johnson & Johnson Vision on the parameters that matter: base curve, diameter, power range, oxygen performance (Dk), and wear and replacement schedules. Use the brand filters to jump to a manufacturer, sort any column to rank products on a single attribute, or search to find a specific lens.

Learn the reasoning behind the data

Numbers are only useful if you know what they mean. Our growing library of plain-language guides explains the clinical thinking behind the reference tables:

• How to read a contact lens specification: every column explained.
• Understanding Dk, Dk/t & oxygen transmissibility: what the oxygen numbers really tell you.
• Vertex distance conversion: why spectacle and contact lens powers differ.
• Replacement schedules compared: daily, two-week and monthly trade-offs.
• Toric & astigmatism basics and multifocal fitting basics.

Browse all guides & references →

ODAtlas is a convenience reference and does not replace manufacturer documentation or clinical judgement. Always verify specifications and dosing against official sources before prescribing. See our full disclaimer.