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blindsight in children: does it exist and can it be used to help the child? observations on a case series

Published online by Cambridge University Press:  12 September 2005

natalie j boyle
Affiliation:
tennent institute of ophthalmology, gartnavel general hospital, glasgow, uk.
david h jones
Affiliation:
tennent institute of ophthalmology, gartnavel general hospital, glasgow, uk.
ruth hamilton
Affiliation:
department of clinical physics, greater glasgow nhs board, uk.
katherine m spowart
Affiliation:
department of paediatrics, yorkhill division, greater glasgow nhs board, uk.
gordon n dutton
Affiliation:
tennent institute of ophthalmology, gartnavel general hospital, glasgow, uk.
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Abstract

damage to the occipital lobe of the brain results in hemianopia when unilateral, and cerebral blindness when bilateral. however, in some cases a degree of visual function persists in the blind visual field. this aim of this study was to describe this phenomenon of ‘blindsight’ in a cohort of children with brain-damage and to relate the clinical features to their visual evoked potentials. we performed a retrospective analysis of 541 case records of children referred to a tertiary vision-assessment clinic in the royal hospital for sick children, glasgow, uk from 1992 to 2002. a total of 541 patients were analyzed (243 females, 298 males; age range 2mo to 19y 6mo, mean 6y 2mo). in 19 children with profound visual impairment and four children with hemianopia (12 females, 11 males; age range 1 to 18y, mean age 8y 3mo), evidence of perception of movement in the blind visual field was found and is described. flash visual evoked potentials varied from no response to normal and was not correlated with visual behaviour. recognition, detection, and use of this phenomenon in children is vital to their rehabilitation and interaction with their surroundings.

Type
original articles
Copyright
© 2005 mac keith press

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