Parallax: Not every pupilometer is designed to reduce error from operator-induced parallax. By doing so, you’ll reduce the uncertainty in your measurements: With an instrument assumed to be in good order, always keep the following areas of potential error in mind. This article will explain some basic pupillometry techniques along, with some ophthalmic optics principles as they relate to vision and eye movement.įor starters, we’ll assume your favorite pupilometer is in proper operational order and properly calibrated-meaning the PD values found are accurately indicated by the instrument’s scales. The tools for doing this range from simple PD rulers to digital pupilometers (also spelled “pupillometers”) to sophisticated digital centration systems that allow for various other measurements to be taken. One of the basic tasks in ophthalmic dispensing is measuring the distance between a patient’s pupils, a prerequisite for properly positioning and fitting eyeglasses.
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