Recording the spontaneous and involuntary pupil movement in darkness is the simplest method to measure and evaluate sleepiness objectively.
The F²D Fit-For-Duty test is an easy to operate, non-invasive and fast tool to obtain an objective assessment of the central nervous activation and drug related vigilance.
The F²D is designed as a portable system for roadside testing and measurements at the workplace. The complete sytem fits in two cases.
The F²D is the ideal tool for screening and expert opinion of daytime sleepiness . The system also provides useful data for shift work, pilots, (truck) drivers or for personnel in high risk careers.
Areas of application are research, police and pharmacology in the lab an road-side.
Spezifikation des F2D
- infrared goggles
- Recording time up to 11 minutes
- Sampling frequency 25 Hz
- Spatial resolution 0,05 mm
- Integrated patient data base
- Comfortable import/export of data
- Built-in backup
- All data in ASCII-format
- Fits in 2 cases
- Windows® XP
The sleepiness waves are monitored by means of head mounted binocular video goggles. The subject sees a dim fixation target.
The pupil movement is recorded for up to 11 minutes, and from this pupillogram (orange/ yellow) the pupillary unrest index PUI (green) is calculated. The PUI value is a quantitative measurement of the pupil diameter variation and sleepiness. The PUI is compared against a standard reference (green/yellow/red) and no further data evaluation is needed.
The protocol gives additional helpful information about the pupil diameter and the PUI over time, the horizontal and vertical eye position, the rate and duration of blinks and the data quality.
The F²D is powered by an external power supply or alternatively by a car battery.
These two examples illustrate the characteristic pupil diameter variation caused by daytime sleepiness. The time course of the dupil diameter is plotted. The upper diagram of an alert subject shows much less pupil diameter changes than in the lower diagram of a sleepy subject. Notice the extreme undulations of a sleepy person's pupil.