How to Use a Phoropter: A Step-by-Step Guide to the Controls
Knowing how to use a phoropter comes down to running its controls in a fixed order, every time: level the...
Articles
How Does an Autorefractor Work? Measurement Principle, Workflow and Reading the Printout
How does an autorefractor work? In a few seconds per eye it shines invisible near-infrared light into the eye, captures...
Manual Phoropter Guide: Anatomy, Specs and a Buying Checklist
A manual phoropter is still the instrument most US exam lanes refract with. It is a mechanical refractor: every lens...
Trial Lens Sets and Trial Frames: What to Look For
A trial lens set is one of the few instruments in an exam lane that will still be working in...
Ezer ERK-BH Autorefractor Keratometer: Full Specs and Practice Fit
Most write-ups of the Ezer ERK-BH autorefractor stop at two numbers: a dioptric range of −30.00 to +25.00 D and...
Ezer EDR-H Digital Phoropter: Specs, Lane Workflow & Practice Fit
The Ezer EDR-H digital phoropter is the refraction head at the centre of Ezer's digital exam room — a motorised,...
