Surgery – Truss – Pad
Patent
1993-11-18
1995-12-12
Pellegrino, Stephen C.
Surgery
Truss
Pad
128745, A61B 1300
Patent
active
054740819
ABSTRACT:
A method and apparatus determine defective magnocellular pathway in the visual system of a subject. Such determination of defective magnocellular pathway in turn is deterministic of dyslexia. The invention method and apparatus presents to a subject eye a series of patterns spatially varying in light intensity, such as a checkerboard pattern. Each pattern provides a certain respective degree of contrast between areas of varying light intensity. In displaying each checkerboard pattern, it is alternated with display of its contrast reverse pattern at a frequency between about 0.5 Hz and about 15 Hz. The temporal frequency from one checkerboard pattern to the next checkerboard pattern in the displayed series of patterns is in the range of about 30 patterns per minute to hundreds of patterns per minute. Response of the eye, such as the visually evoked potential, to each pattern is measured as the pattern is being displayed. And the measured responses are compared to a predetermined range of standard
ormal responses for the given displayed patterns. Measured responses falling outside of the predetermined range of standard
ormal responses indicate a magnocellular pathway defect, and hence dyslexia.
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Galaburda Albert M.
Livingstone Margaret S.
Pellegrino Stephen C.
President and Fellows of Harvard College
Tucker Guy V.
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