Postural Stability Changes during the Prism Adaptation Test in Patients with Intermittent and Constant Exotropia

Abstract

Postural instability became more pronounced by the prism adaptation test in the patients with exotropia. Binocular visual and motor perceptional changes induced by the prism adaptation test could lead to postural instability, with adaptation taking place 60 minutes after the start of the test.

Re-alignment of the eyes, with prisms and with eye surgery, affects postural stability differently in children with strabismus

“…For a long time, this test has been used to determine the surgical amount of the recession/resection of the extra-ocular muscle and predict the subject's binocular status after the surgical correction of deviation; [17,20,21] however, only the recent study by Matsuo et al [12] examined the effect of prism adaptation on postural control. The present study confirms and expands the study by Matsuo et al [12] showing that adult subjects with strabismus experience poor postural stability while wearing prisms to reduce and/or eliminate eye deviation. Indeed, the data obtained here from strabismic children showed that eye alignment by wearing prisms is not sufficient to improve postural stability.…”

“…A recent study by Matsuo et al [12] examined the effect of prismatic adaptation on postural control in strabismic adults. Seventeen subjects with constant or intermittent exotropia participated in the study.…”

Postural control in strabismic children: importance of proprioceptive information

“…This study suggests that binocular visual information plays an important role in influencing postural control. Also, Odenrick et al (1984) observed a greater instability in children with divergent strabismus when compared to children with convergent strabismus, and Matsuo et al (2010) found that strabismic children with no binocular vision were more instable than strabismic children with binocular vision. Legrand et al (2011) also observed poor postural control in children with strabismus (divergent or convergent) and showed evidence of an improvement in postural control in these children 2 months after strabismus surgery.…”

Walking strategies in subjects with congenital or early onset strabismus

“…Several authors (Odenrick et al, 1984;Matsuo et al, 2006Matsuo et al, , 2010Matheron et al, 2007;Legrand et al, 2011;Gaertner et al, 2013a;Lions et al, 2013;Przekoracka-Krawczyk et al, 2014) found that subjects with congenital or early onset strabismus have a significantly lower static and dynamic balance than HS. However, a binocular visual stimulation plays an important role in postural control of patients with strabismus (Gaertner et al, 2013b).…”