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Han Woong Lim, Jung Wook Lee, Heeyoon Cho, Yumi Song, Moon sang won, Byung Ro Lee, Sei yeul oh; Quantitative measurement of the angle of ocular movements in patients with horizontal strabismus. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):5223. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
To measure the maximum angle of horizontal versions in patients with comitant horizontal strabismus.
One hundred two subjects with comitant exotropia and Fifty-two subjects with comitant esotropia were included. Photographs were obtained in the cardinal positions of gaze and the images were processed using Photoshop. The images were analyzed using the Image J program to measure the angle of version (Fig 1). The maximum angle of horizontal versions (dextoversion and levoversion) was quantified using a modified limbus test.
The mean angle of adduction (38.1±7.2°) was smaller than that of abduction (46.6±8.5°) in patients with exotropia (P < 0.001) (Fig 2). In patients with esotropia, the mean angle of abduction (45.4±6.3°) was smaller than that of adduction (48.1±8.3°) (P = 0.039). There was a significant negative correlation between the angle of adduction and the prism diopter of exotropia in patients with exotropia (R = -0.367, P = 0.001). The angle of abduction and the prism diopter of esotropia showed no correlation in patients with esotropia (R = -0.215, P = 0.065).
The angle of adduction and abduction on horizontal versions were asymmetric in patients with horizontal strabismus. These findings suggest that assessment of the angle of ocular movements is required for better understanding of inequality of the conjugate eye movements in horizontal strabismus.
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