Consistency of Spectacle Measurements using Electronic Devices

ackground: The purpose of this project is to determine if one of the electronic devices for taking measurements for a pair of glasses is more accurate than the others for the measurements of pupil distance, segment height, pantoscopic tilt, and vertex distance.
Methods : Data was obtained on 25 participants. The four measurements were obtained using different optical devices and manually. The devices used were the Essilor Visioffice, and two ipad applications called the Optikam and the Spectech. After measurements were obtained, percent en-or for each device was calculated to determine the most accurate method.
Results : There was not a single method that was the most accurate in all four measurements analyzed. The two best methods were the Spectangle and VisiOffice for pupillary distance. Manual measurement and VisiOffice were the most accurate form to detennine vertex distance. Manual measurement was the most accurate method for detennining pantoscopic tilt. Lastly, the SpecTech was the most accurate measurement method for segment height.