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[Equilibriometric findings in partially blind and blind children (author's transl)]
Insights
Vestibular-ocular and vestibular-spinal tests reveal differences in blind children. Blind-born children exhibit higher spontaneous activity and diminished nystagmus and equilibrium responses.
Area of Science:
- Ophthalmology
- Neurology
- Vestibular System
Background:
- Vestibular function is crucial for balance and spatial orientation.
- Assessing vestibular function in children with visual impairments presents unique challenges.
- Understanding these challenges is key to accurate diagnosis and rehabilitation.
Purpose of the Study:
- To evaluate vestibular-ocular and vestibular-spinal function in blind and partially blind children.
- To compare the vestibular responses between blind-born and partially blind children.
- To identify potential factors influencing vestibular function in this population.
Main Methods:
- Electronystagmography was used to record per- and postrotatory nystagmus during the Rotatory-Intensity-Damping test.
- The Unterberger's stepping test with Cranio-Corpo-Gram assessed body sway for vestibular-spinal function.
- 26 children, both blind and partially blind, participated in the study.
Main Results:
- Most children showed definite per- and postrotatory nystagmus despite spontaneous reactions.
- Eyelid movements and diminished corneo-retinal potential complicated electronystagmogram interpretation.
- Blind-born children displayed higher spontaneous activity, reduced nystagmus, and poorer equilibrium compared to partially blind children.
Conclusions:
- Significant differences in vestibular responses exist between blind and partially blind children.
- Habituation and inhibitory efferent vestibular pathways may explain observed differences.
- These findings highlight the need for tailored vestibular assessments in visually impaired children.
Abstract:
26 of both blind or partially blind children were subjected to equilibriometric tests. By way of a vestibular-ocular test they were given the Rotatory-Intensity-Damping test. During the tests the per and postrotatory nystagmus reactions were electronystagmographicly registrated. For the vestibular-spinal tests the Unterberger's stepping test with photographic registration of the body-sway in the Cranio-Corpo-Gram was used. In most of the children you could identify a definite per and postrotatory reaction in spite of considerable spontaneous reactions. The strong eyelid movements of these patients, the intensive spontaneous deviations and diminished corneo-retinal potential made precise judgement of the electronystagmogram difficult. Comparison between the blind and partially blind children enabled the differences to be objectified. Blind-born children have a higher spontaneous activity, slightly diminished per and postrotatory nystagmus reactions and a diminished bodyequilibrium. These results can be explained on one side by habituation and on the other side by efferent structures, which have an inhibitory effect on the vestibular input.