The BEFIE test: Using The Observer to validate a new medical instrument.
The Observer has been used to validate a newly developed test - the BEFIE test - to determine the width of the visual field of neurologically impaired children. Contrary to neurologically unimpaired children, these children may not be able to react with stimulus-directed behavior at a visual stimulus because they lack certain functions. To get round this problem, the BEFIE test ascertains eye movements to the detection of a visual stimulus. The angle at which the subject first detects the presence of the stimulus determines the size of the visual field.
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