Patent ID: 7540613

Claim:
A hand held device to detect the effects of impaired blood flow in the eye of a subject, the device comprising: a light source for emitting a light, a light diffusing means adapted to receive the light from the light source and to redirect the light toward the eye of a subject, wherein the light diffusing means redirects the light to provide a substantially even illumination to the retina of the eye; means to provide the retina with substantially constant illumination from the light, regardless of the size of the pupil of the eye; at least one electrode adapted to contact the subject at a location proximate to the eye, the at least one electrode receiving an electrical signal from the eye of the subject responding to the stimulation by the light directed toward the eye, and an electronic circuit to control the light directed toward the eye of the subject and to measure the electrical signal received by the at least one electrode to determine whether blood flow is impaired within the eye of a subject.