Back to results
US 12,114,224 B2Granted
Method and device for detection and assessment of marijuana impairment
OwnerDenise A Valentiinventor
Life of this patent
Estimating the term…
Abstract
A method of identifying individuals impaired by a psychoactive substance such as cannabis. The method includes presenting monocularly to a subject being tested; to each eye separately, a sinusoidal grating pattern of fixed spatial frequency with achromatic contrast or color contrast between grating stripes being temporally alternately modulated at a temporal frequency that ranges between 10 Hz and 60 Hz with a pattern of the contrast being such that the subject being tested can see a frequency doubling in the grating pattern.
Claims18
A method impairment testing in the field to identify individuals impaired by a psychoactive substance other than alcohol, the method comprising:
- locating a virtual reality head worn device on the subject's head and so that the subject's visual field is limited by the virtual reality head worn device;
- monocularly presenting via the virtual reality head worn device to the subject being tested;
- to each eye separately, at least a first pattern of fixed spatial frequency with achromatic contrast between dark areas and light areas, the achromatic contrast between the dark areas and the light areas being temporally alternately modulated at a temporal frequency that ranges between 10 Hz and 60 Hz with a pattern of the contrast being such that the subject being tested perceives a frequency doubling in the pattern thereby evaluating retinal function, the first pattern having a first contrast ratio/value;
- monocularly presenting via the virtual reality head worn device to the subject being tested;
- to each eye separately a second pattern of fixed spatial frequency with achromatic contrast between dark areas and light areas, the achromatic contrast between the dark areas and the light areas being temporally alternately modulated at a temporal frequency that ranges between 10 Hz and 60 Hz with a pattern of the contrast being such that the subject being tested perceives a frequency doubling in the pattern, the second pattern having a second contrast ratio/value different from the first pattern
- querying whether the subject being tested perceives a frequency doubling for each of the first pattern and second pattern;
- identifying the first pattern in which frequency doubling is reported and the second pattern in which frequency doubling is not reported;
- when the first pattern is within the range of expected values, indicating that the test subject is not impaired;
- and
- when the first patterns is not within the range of expected values then indicating that the test subject is impaired.
7 more elements
A virtual reality head worn device for use in field impairment testing to identify individuals impaired by a psychoactive substance other than alcohol, the device comprising:
- an enclosure that limits vision of a subject being tested to a display on which images are displayed monocularly to the subject being tested;
- the virtual reality head worn device being configured to present to each eye separately, at least a first pattern of fixed spatial frequency with achromatic contrast between dark areas and light areas, the achromatic contrast between the dark areas and the light areas being temporally alternately modulated at a temporal frequency that ranges between 10 Hz and 60 Hz with a pattern of the contrast being such that the subject being tested perceives a frequency doubling in the pattern thereby evaluating retinal function, the first pattern having a first contrast ratio/value;
- the display on which images are displayed monocularly to a subject being tested;
- to each eye separately a second pattern of fixed spatial frequency with achromatic contrast between dark areas and light areas, the achromatic contrast between the dark areas and the light areas being temporally alternately modulated at a temporal frequency that ranges between 10 Hz and 60 Hz with a pattern of the contrast being such that the subject being tested perceives a frequency doubling in the pattern, the second pattern having a second contrast ratio/value different from the first pattern;
- the display being coupled to a processor that is programmed with an algorithm by which an operator can control the display to present the following procedure;
- querying whether the subject being tested perceives a frequency doubling for each of the first pattern and second pattern;
- identifying the first pattern in which frequency doubling is reported and the second pattern in which frequency doubling is not reported;
- when the first pattern is within the range of expected values, indicating that the test subject is not impaired;
- and
- when the first patterns is not within the range of expected values then indicating that the test subject is impaired.
7 more elements
Dependencies are inferred from the claim text.