The ability to consistently take PD measurements is a requirement for modern-day optical dispensing. Thanks to Ezer’s quality-designed EPD-1800 you and your staff will save time and enjoy more accurate prescriptions. The EPD-1800 efficiently measures the distance between the visual axes of the two eyes. Good PD measurements are essential for proper optical alignment and binocular vision. With the EPD-1800 you will enjoy wide range measurement capabilities, digital read and LED—all in a lightweight device that is accurate, consistent and easy to use Features of the EPD-1800 Pupillometer Easy to Use Wide Range Measurements Digital Read Adjustable LED Power-Save More Reliable than Millimeter Rule It takes a tremendous amount of skill to accurately and consistently perform PDs by millimeter rule. A nasal cut for monocular PDs and a penlight to highlight the corneal reflex are all required and depend upon very good technique. On the other hand, pupillometers minimize errors, require less skill, are faster and reduce variability.