The Mental Workload and Visual Fatigue among Freight Transport Drivers

Abstract

This cross-sectional study aimed to assess visual fatigue and psychological workload stress among 41 freight drivers in Pathum Thani Province. Data were collected using a personal information questionnaire, work-related information questionnaire, and the Subjective Workload Index (SWI), along with visual fatigue assessment using a Lafayette 12021A Flicker Fusion monitor, measuring Critical Flicker Fusion (CFF) before starting work and after at least 3 hours of work. Data were analyzed using descriptive statistics. The results showed that all drivers were male, with more than 10 years of driving experience (51.22%), and had high levels of psychological workload stress (SWI) (22.00%). The most common visual problem was... The most common symptom reported by truck drivers was eye irritation from sunlight or headlights (56.09%), followed by eye strain and blurred vision (51.22%). Eye strain measurements revealed that 43.90% of employees experienced eye strain based on their CFF (Continuous Flatness Assessment) after work. The majority (70.73%) reported an acceptable risk level for eye strain, followed by a group with a low risk (24.39%). The study found that truck drivers experience moderate to high levels of mental stress from their work and a relatively high proportion of eye strain. Therefore, continuous monitoring of their mental health and eye strain is recommended to prevent impacts on workplace safety, and the study should be expanded to include a larger group of employees.