June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
Quantitative measurement of the angle of ocular movements in patients with horizontal strabismus
Author Affiliations & Notes
  • Han Woong Lim
    Ophthalmology, Hanyang University Guri Hospital, Guri, Korea (the Republic of)
  • Jung Wook Lee
    Ophthalmology, Hanyang University Guri Hospital, Guri, Korea (the Republic of)
  • Heeyoon Cho
    Ophthalmology, Hanyang University Guri Hospital, Guri, Korea (the Republic of)
  • Yumi Song
    Hong Ik Hospital, Seoul, Korea (the Republic of)
  • Moon sang won
    Hanyang university hospital, Seoul, Korea (the Republic of)
  • Byung Ro Lee
    Hanyang university hospital, Seoul, Korea (the Republic of)
  • Sei yeul oh
    Sungkyunkwan university samsung hospital, Seoul, Korea (the Republic of)
  • Footnotes
    Commercial Relationships Han Woong Lim, None; Jung Wook Lee, None; Heeyoon Cho, None; Yumi Song, None; Moon sang won, None; Byung Ro Lee, None; Sei yeul oh, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 5223. doi:
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    • Get Citation

      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.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose
 

To measure the maximum angle of horizontal versions in patients with comitant horizontal strabismus.

 
Methods
 

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.

 
Results
 

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).

 
Conclusions
 

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.  

 
Figure 1. Image processing by Photoshop and Image J for quantitative measurement of the ocular movement. A, Semi-transparent image of depression was overlapped with primary position image using Photoshop. B, The overlapping image was converted to identify the margin of limbus using Photoshop. C, Geometrical analysis with Image J showing degrees of ocular rotation of the limbus.
 
Figure 1. Image processing by Photoshop and Image J for quantitative measurement of the ocular movement. A, Semi-transparent image of depression was overlapped with primary position image using Photoshop. B, The overlapping image was converted to identify the margin of limbus using Photoshop. C, Geometrical analysis with Image J showing degrees of ocular rotation of the limbus.
 
 
Figure 2. Case. Composite images as an outcome of overlapping with the layer of the primary position and processing by Photoshop.The angle of adduction is lower than that of abduction on both dextroversion (47.6° vs. 50.8°) and levoversion (35.5° vs. 43.1°) in this patient.
 
Figure 2. Case. Composite images as an outcome of overlapping with the layer of the primary position and processing by Photoshop.The angle of adduction is lower than that of abduction on both dextroversion (47.6° vs. 50.8°) and levoversion (35.5° vs. 43.1°) in this patient.

 
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