Review on 👓 Huanyu Digital Pupilometer Optical PD Meter with LCD Display, CE Approved - 45-82mm Pupil Meter LY-9S by Kevin Robinson

TL;DR: Stick to the traditional design with manual sliders and an optical knob. vertical indicators on manual sliders. This is an elegant concept which, in theory, should provide better measurement reproducibility. In practice, they removed the necessary features to make this work. The range selector calculates (evaluates) any other PD value as infinity, so it's no better than just guessing using the usual methods (e.g. subtracting 1.5mm). The only optical measurement is at infinity. A monocular PD measurement (by closing one eye and measuring the other) is useless as there is no physical cover over the window. The LCD panel blocks light in only one direction, and that direction faces the technician, so the patient still sees the image with both eyes. arrived broken.