Assessment of extraocular muscle motility in patients with concomitant and non-concomitant strabismus with vertical component using automated analysis of two-dimensional eye globe pictures in diagnostic gaze positions

Background. Existing assessment methods of the extraocular oblique muscle (EOOM) function are subjective ones and difficult to perform. It leads to inaccurate diagnosis and errors during surgery planning. Purpose. To examine extraocular muscle motility in patients with concomitant and non-concomitant strabismus with a vertical component using developed method of automated analysis of two-dimensional eye globe pictures in the diagnostic gaze positions. Material and methods. 60patients with strabismus and vertical component were examined. EOOM function was assessed in the adduction position using the developed method and conventional ones: 1) Wright K. E. method where squinting eye angle of the optic axis deviation from horizontal line is assessed; 2) Alazme A. method where squinting eye vertical deviation is assessed in degrees by Hirschberg test. Results. The developed method accurately assessed EOOM function in patients with concomitant and non-concomitant strabismus with a vertical component. Cluster analysis sorted out 3 degrees of EOOM dysfunction, which correlated with conventional diagnostic methods data in 66.6?80 % of cases. Conclusion. The developed method of automated analysis of the extraocular muscle function simplified and objectified examination of the oblique muscle dysfunction in strabismus patients.