Multi-point flicker recognition apparatus and its application for video display terminal work

Area of Science:

• Ophthalmology
• Neuroscience
• Human Factors Engineering

Background:

• Assessing visual fatigue is crucial for understanding the impact of modern visual tasks.
• Existing methods for measuring critical flicker fusion frequency (CFF) may lack precision in evaluating peripheral visual field changes.
• The development of advanced tools is needed to capture nuanced visual performance decrements.

Purpose of the Study:

• To introduce a novel multi-point critical flicker fusion frequency (MCFF) apparatus for enhanced CFF measurement.
• To evaluate the practical applicability of the MCFF apparatus in assessing visual fatigue after different types of workloads.
• To compare the impact of digital (TV game, VDT-Kraepelin) versus traditional (paper-Kraepelin) tasks on visual function.

Main Methods:

• Development and utilization of a multi-point critical flicker fusion frequency (MCFF) apparatus.
• Measurement of CFF variations in central and peripheral visual fields before and after specific workloads.
• Analysis of correlation in variation rates between central and peripheral CFF values across different tasks.

Main Results:

• Peripheral CFF values exhibited a greater decrease than central CFF values following visual workloads.
• The study identified significant correlations in CFF variation rates between the two eyes in peripheral fields.
• Digital workloads (TV game, VDT-Kraepelin) demonstrated higher numbers of correlated peripheral eye fields compared to the paper-Kraepelin task.

Conclusions:

• The MCFF apparatus offers a more precise method for determining CFF and assessing visual fatigue.
• Peripheral visual fields are more susceptible to fatigue from digital visual tasks than previously understood.
• The findings highlight the differential impact of digital versus traditional workloads on visual performance and suggest the utility of MCFF in occupational health assessments.