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Assessment of deviation angle and oblique muscle function in strabismus patients using analysis of two‐dimensional eye globe pictures in diagnostic gaze positions
Author(s) -
Bushuyeva N.,
Romanenko D.
Publication year - 2015
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2015.0446
Subject(s) - strabismus , gaze , pupil , minimum deviation , oblique case , medicine , extraocular muscles , ophthalmology , exotropia , standard deviation , position (finance) , optics , optometry , orthodontics , mathematics , computer vision , physics , statistics , computer science , linguistics , philosophy , finance , economics
Purpose To develop simple and fast method of deviation angle and extraocular muscle ( EOM ) function examination in strabismus patients. Methods Pictures of eye globes in 12 diagnostic gaze positions were taken. They were analyzed using developed software: for both eyes the program calculated pupil center shift relative to pupil center position in primary gaze for each gaze position in millimeters. 140 volunteers (70 adults and 70 children) without EOM pathology and refraction anomalies were examined to create reference interval database for each gaze position. 148 strabismus patients were examined using developed method and conventional ones: Hirschberg and Fresnel prism tests for deviation measurement, 0–4 scale was used to assess oblique muscle function. Results Eye globe shifts in healthy adults and children mainly ranged from 3 to 4.5 mm, maximal shifts equaled 6.5 mm in adults and 5.5 mm in children. Correlation coefficient between deviation angle measured with the method and Hirschberg test was 0.797, mean difference between measurements was 1.1º. Correlation coefficient between the method and Fresnel prism test was 0.881, mean difference between measurements was 3.8 PD . Cluster analysis sorted out 3 degrees of oblique muscle disfunction measured with the developed method. They in 80% correlated with conventional scale. Conclusions Developed automated method of deviation angle and EOM function assessment simplifies and objectifies examination of strabismus patients.