NCT07291856

Exploring the Impact of Dynamic Defocus Display Schemes on Ocular Health Indicators

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 36 (actual)
• Sponsor: Beijing Tongren Hospital · Academic / Other
• Sex: All
• Age: 20 Years – 40 Years
• Healthy volunteers: Accepted

Summary

The present study is designed to explore the effects of dynamic defocus display technology on ocular health parameters using rigorous scientific approaches. It further examines the mechanisms through which this technology alleviates visual fatigue, thereby providing robust clinical evidence to support its practical application and widespread adoption.

Detailed description

Research Content Recruit adults who meet the inclusion criteria and have long-term use of VDT (Visual Display Terminal) devices for the trial. Compare the impact of different dynamic defocus modes on the visual fatigue symptoms of the subjects. Analyze the mechanisms through which dynamic defocus modes alleviate visual fatigue. Research Outcome Measures Primary Outcome Measures and Definitions Binocular Visual Function: A series of assessments of visual ability, including accommodative function (amplitude of accommodation, accommodative facility) and vergence function (near point of convergence, AC/A ratio). Secondary Outcome Measures and Definitions Critical Flicker Fusion Frequency (CFF): To evaluate the degree of eye fatigue, with lower measured values indicating a higher degree of fatigue. Visual Fatigue Questionnaire Score: To assess the subjective level of visual fatigue experienced by the subjects. Refraction Results: To monitor changes in refractive status during the trial and evaluate the impact of different dynamic defocus modes on refractive state when using VDT devices at near distance.

Conditions

• Visual Fatigue
• Myopia

Interventions

Type	Name	Description
BEHAVIORAL	Dynamic Defocus Mode	Participants are required to complete a 50-minute video-watching task using a terminal display device that contains video content processed with different dynamic defocus modes. Specifically, participants will watch the same series of videos in different dynamic defocus modes. Participants will complete a total of 5 sets of video tasks (including the control group) in a random order.

Timeline

• Start date: 2025-08-20
• Primary completion: 2025-11-20
• Completion: 2025-11-30
• First posted: 2025-12-18
• Last updated: 2025-12-18

Locations

1 site across 1 country: China