Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-06-19
1999-09-21
Dang, Hung Xuan
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351246, A61B 310
Patent
active
059561254
ABSTRACT:
An easily administered, non-invasive, sensitive and specific system and method for screening persons for dementia, particularly dementia of the Alzheimer's type, is provided. The system and method include means for irradiating the eye of a person with light, preferably light solely within the infrared spectrum, and means for generating a signal responsive to the amount of light reflected from the eye over a period of time. This signal is indicative of changes in the pupil's size over time. The system and method further include means for performing a Fourier transform upon this signal to provide a value indicative of the strength of this signal's frequency components. This value then is compared against a predetermined threshold value and, if this threshold value is exceeded, a higher probability is assigned to the person having dementia, particularly dementia of the Alzheimer's type.
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Deutsch Stephen I.
Johri Surendra K.
Rosse Richard B.
Schwartz Barbara L.
BioProbes, Inc.
Dang Hung Xuan
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