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KMID : 1011420100150010117
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Journal of Korean Ophthalmic Optics Society
2010 Volume.15 No. 1 p.117 ~ p.122
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A Study on the Active Force of Extraocular Muscles
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Kim Sang-Moon
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Abstract
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Purpose: The purpose of this study was to measure the active force of extraocular muscles on mono- and bi-nocular movements for 62 healthy koreans (male: 29, female: 33).
Methods: The force of adduction, abduction, elevation and depression of right and left eye on monocular movement were tested with horizontal moving distance based on corneal limbus and the force of superior oblique muscle and inferior oblique muscle on binocular movement were measured with vertical moving distance between corneal limbus. The distances were obtained by high resolution digital image processing.
Results: At monocular movements of tested subjects, the power of abduction, adduction, elevation and depression of right and left eye were (male) 9.35 mm, 9.75 mm, (female) 9.02 mm, 9.52 mm, (male) 10.23 mm, 10.16 mm, (female) 10.17 mm, 10.07 mm, (male) 7.01 mm, 6.91 mm, (female) 6.98 mm, 6.64 mm, (male) 7.52 mm, 6.82 mm, (female) 7.52 mm, 6.67 mm, respectively. The active force of binocular movements were 54.8% hyperergasia and 45.1% hypergasia/67.7% hyperergasia and 32.2% hypergasia with inferior oblique muscle, 64.5% hyperergasia and 35.5% hypergasia/58.1% hyperergasia and 41.9% hypergasia with superior oblique muscle, respectively.
Conclusions: The force of horizontal movement was higher than vertical movement. The value of adduction was higher than abduction on horizontal movement, and the value of depression was higher than elevation on vertical movement. In the both of inferior and superior oblique muscle, the ratio of hyperergasia was higher than that of hypergasia.
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KEYWORD
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Monocular movement, Binocular movement, Elevation, Depression, Abduction, Adduction, Superior oblique muscle, Inferior oblique muscle
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