Fatigue

Solution: Fatigue

Fatigue, refers to an overwhelming sense of tiredness, lack of energy and a feeling of exhaustion, associated with impaired physical and/or cognitive functioning. Fatigue is recognized as an important factor in today’s world where people experience a weakness, weariness, eye strain, pain in back, neck and shoulders (Bullough, Akashi, Fay, Figueiro, 2006; Blehm, Vishnu, Khattak, Mitra, Yee, 2005; Ukai, 2008). Fatigue can narrow focus and attention leading to a lack of proper performance resulting in human error related to information processing and decision making (Rajabi-Vardanjani, et al., 2013).

Eye Tracking: Eye tracking is a sensitive, quantifiable, accurate real-time measure of fatigue via eye responses such as changes in the fixation disparity (Glimne, Öqvist Seimyr, Ygge, Nylén, Brautaset, 2013), blinking (Divjak, Bischof, 2009), vergence (Sirohey, Rosenfeld, Duric, 2002; Pickwell, Jenkins, Yekta, 1987; Ukwade, Bedell, Harwerth, 2003) and other eye movements (e.g. Hu & Lodewijks, 2021).

HarmonEyes uses the eye tracking signal, machine learning and AI to answer the following questions related to fatigue:

  1. What is your current level of fatigue?
    1. Low Fatigue: low level of tiredness, low level of physical or cognitive dysfunction, no eye strain. Significant reserve and alertness available if needed to perform tasks.
    2. Moderate Fatigue: moderate level of tiredness, reduced energy, may have a headache, focus is noticeably impaired, eyes experience tiredness, and some strain. Some performance effects, especially in long sequential processing tasks requiring rapid decision making could be slowed.
    3. High Fatigue: difficulty focusing, difficulty making decisions, exhaustion, low energy, eye strain. Impaired physical functioning. Performance is slow and severely impaired.
  2. When will fatigue level change? This assumes the same activity is engaged in without intervention.
    1. Predicted future fatigue level:
      1. Low
      2. Moderate
      3. High
    2. Time to reach future state:
      1. Minutes and seconds
      2. Milliseconds
    3. Likelihood window:
      1. Ceiling level: defined as the average root mean squared error plus one standard deviation.
      2. Floor level: defined as the average root mean squared error minus one standard deviation.
    4. Probability (%):
      1. current level of fatigue
      2. other levels of fatigue