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[Effects of short-term VDT usage on visual functions]
Xiao-mei Qu1, Ren-yuan Chu, Lin Wang
1Department of Ophthalmology, Eye Ear Nose & Throat Hospital, Fudan University, Shanghai 200031, China. quxiaomei2002@126.com
[Zhonghua Yan Ke Za Zhi] Chinese Journal of Ophthalmology
|December 2, 2005
Summary
Short-term video display terminal (VDT) use temporarily impairs visual functions, including reduced accommodation and tear film quality. It also increases convergence issues and visual aberrations, impacting overall visual performance.
Area of Science:
- Ophthalmology
- Optometry
- Human Factors
Context:
- Digital eye strain is a growing concern with increased screen time.
- Understanding the immediate physiological impacts of VDT use is crucial for occupational health.
Purpose:
- To assess the acute effects of one-hour video display terminal (VDT) usage on various visual parameters.
- To compare visual function changes in VDT operators versus a control group.
Summary:
- VDT use led to significant decreases in accommodation amplitude and tear film break time (BUT).
- Near point of convergence and lateral exophoria significantly increased post-VDT use.
- Total, high-order, 4th, and 5th-order aberrations were notably elevated after VDT exposure.
Impact:
- Short-term VDT work induces measurable, temporary declines in visual performance and ocular surface integrity.
- Findings highlight the need for ergonomic considerations and visual breaks during prolonged VDT operation.