This study will evaluate whether full-spectrum screen bar lighting can reduce eye fatigue and dry eye symptoms after a standardized screen task. Prolonged screen use is common in daily work and study and may cause blurred vision, eye soreness, dryness, headache, and reduced attention. Light environment may be one way to improve visual comfort during screen use, but more controlled clinical evidence is needed.
In this randomized, parallel-group controlled study, 112 healthy adult participants will be assigned to either a full-spectrum screen bar lighting group or a brightness-matched control group without screen bar lighting. Participants in both groups will complete an approximately 2-hour standardized screen task in a controlled laboratory environment. The study will compare changes before and after the task in objective and subjective measures of visual fatigue and dry eye, including critical flicker fusion frequency, visual fatigue questionnaire scores, eye movement and blinking parameters, pupil parameters, tear film-related measurements, and dry eye symptom scores. Safety and discomfort during the study will also be recorded.
Age 18 to 35 years, male or female.
Average daily electronic screen exposure of at least 4 hours.
Near visual acuity at 40 cm of 0.5 or better, and able to complete the study 1. tasks and measurements stably.
Able and willing to provide written informed consent.
Presence of ocular inflammation or ocular disease.
History of severe systemic disease, neurological disease, or psychiatric disorder.
Use of dry eye or visual fatigue treatments, or contact lens wear, within 1 month before the study.
History of ocular surgery within the past 6 months.
Parallel
Full-spectrum screen bar light
DeviceThe full-spectrum screen bar light will be used as task lighting during an approximately 2-hour standardized screen task in a controlled laboratory environment. Participants will complete computer-based text processing, screen reading, or viewing of specified video materials to simulate prolonged near-screen use.
Brightness-matched screen task without screen bar lighting
Other interventionParticipants will complete the standardized screen task without using a screen bar light. Screen brightness will be adjusted to match the brightness condition of the full-spectrum screen bar lighting arm. The task type, content, duration, and completion requirements will be the same as those in the experimental arm.
Change in Critical Flicker Fusion Frequency
Critical flicker fusion frequency (CFF) will be measured in Hz using the Handy Flicker HF-III device. The outcome will be calculated as the post-task CFF value minus the baseline CFF value. This measure will be used as an objective indicator of visual fatigue after the standardized screen task.
Change in Computer Vision Syndrome Questionnaire Score
The Computer Vision Syndrome Questionnaire (CVS-Q) will be used to assess subjective visual fatigue symptoms. The outcome will be calculated as the post-task total score minus the baseline total score.
Change in EyeFatigue Tracker Ocular Behavioral Parameters
Ocular behavioral parameters will be recorded using the EyeFatigue Tracker system during a standardized 1-minute reading task. The assessment will include eye movement, blink, and pupil-related parameters. Change values will be calculated as post-task values minus baseline values.
Change in Keratograph 5M Ocular Surface Assessment
Objective ocular surface and dry eye-related parameters will be measured using the Keratograph 5M system. The assessment will include non-invasive tear breakup time, tear meniscus height, and conjunctival redness. Change values will be calculated as post-task values minus baseline values.
Change in Eye Dryness Score on the 0-100 Visual Analog Scale
Eye dryness will be assessed using the Eye Dryness Score on a 0-100 visual analog scale. Participants will indicate the severity of eye dryness by placing a mark on a 100-mm horizontal line, where 0 represents no eye dryness and 100 represents the most severe eye dryness. Higher scores indicate worse symptoms. The change score will be calculated as the score immediately after the standardized screen task minus the baseline score. A positive change indicates worsening of eye dryness, whereas a negative change indicates improvement.
Click on the lead sponsor to view all of their trials.
This trial is not recruiting at the moment. You can still explore other options:
