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KMID : 1011420100150020155
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Journal of Korean Ophthalmic Optics Society
2010 Volume.15 No. 2 p.155 ~ p.160
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Head Posture-Induced Phoria Deviation
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Ha Eun-Mi
Son Jeong-Sik
Moon Byeong-Yeon
Yu Dong-Sik
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Abstract
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Purpose: The purpose of this study was to evaluate how phoria variations would vary with head positions, as well as to review the need to differentiate prism placement over either eye in a relation to the imbalance of the extraocular muscle.
Methods: This study was carried out with 44 males (88 eyes) and 16 females (32 eyes) aged between 20 and 30. For all subjects, testings were performed using cover test, subjective refraction, phoria and vergence test. To analyze phoria variations comparatively for the head tilt test and the face turn test, phoria deviation were measured using the von Graefe.
Results: For the phoria variation related with head tilt and face turn, a significant difference was observed in the group judged to be abnormal on the horizontal phoria of Morgan’s norm (p<0.05); especially in patients who needed near prescription of Sheard’s criterion, a higher variation was observed (p<0.05). The abnormal group was composed of patients who needed distance prescription of Sheard’s criterion and ones who did not need the prescription, all of whom showed phoria variations, but the mean value was less than the near.
Conclusions: With regard to the head tilt and face turn related phoria level, the patients who needed near horizontal prism prescription of Sheard’s criterion showed a remarkably higher variation. Altogether, it is deemed to check whether extraocular muscles are ill-balanced in both eyes previously to determine the prism power on phoria level to the end that each of prism powers may be accurately determined.
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KEYWORD
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Head tilt, Face turn, Sheard’s criterion, Morgan’s norms, Phoria
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