|Title||Accuracy of a Virtual Maddox Rod Smartphone App for Sensorimotor Examination|
|Author, Co-Author||Kevin Houston, Shrinivas Pundlik, Matteo Tomasi, Gang Luo|
Purpose: A sensorimotor exam measures eye alignment in a miniumum of 4 different gaze directions. The purpose of this study was to develop and evaluate a smartphone app for sensorimotor examination.
Methods: We developed a head-mounted virtual reality (VR) smartphone app to simulate the Maddox Rod test in 4 positions of gaze. Ten adult participants (age < 35) wore the smartphone VR headset and used a Bluetooth remote to align a red line and white dot each visible to only the right and left eyes respectively. Measurements were performed in horizontal and vertical directions 3 times each in primary gaze, and then at gaze 10° left, right, and down. The sequence was repeated with a 7Δ Fresnel prism base-out and then base-down (counterbalanced) over the right eye to provide a ground-truth by which to calculate accuracy of the app. The difference between prism and no prism conditions (within subjects) was the outcome measure.
Results: The mean absolute error (prism nominal value – app measurement) was (0.9 ± 0.6 Δ) in the vertical measurement and (1.3 ± 0.9Δ) in the horizontal measurement.
Conclusion: The app accurately measures the motor field portion of the sensorimotor exam.
|Affiliation of Co-Authors||Schepens Eye Research Institute, Schepens Eye Research Institute, Schepens Eye Research Institute|