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A Study of Full-Spectrum Screen Lighting for Reducing Screen-Related Eye Fatigue and Dry Eye

20 luglio 2026 aggiornato da: Zhongshan Ophthalmic Center, Sun Yat-sen University

A Randomized Controlled Trial of the Effects of Full-Spectrum Screen Bar Lighting on Visual Fatigue and Dry Eye After a Standardized Screen Task

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.

Panoramica dello studio

Stato

Non ancora reclutamento

Condizioni

Intervento / Trattamento

Descrizione dettagliata

Prolonged use of electronic screens is increasingly common in work, study, and daily life and may lead to visual fatigue and dry eye-related symptoms. These symptoms may include blurred vision, eye soreness, dryness, headache, and reduced attention. Although behavioral strategies such as taking breaks and adjusting viewing distance are commonly recommended, their effectiveness may be limited by individual adherence. Optimizing the lighting environment during screen use may provide a standardized and practical approach to improving visual comfort.

This is a single-center, randomized, parallel-group controlled study designed to evaluate the effects of full-spectrum screen bar lighting during a standardized screen task. Eligible healthy adult participants with regular daily screen exposure will be randomly assigned in a 1:1 ratio to either a full-spectrum screen bar lighting group or a brightness-matched control group without screen bar lighting. Both groups will complete the same approximately 2-hour standardized screen task in a controlled laboratory environment. The task may include computer-based text processing, screen reading, or viewing specified video materials, with the task content, duration, and completion requirements kept consistent between groups.

Assessments will be performed before and immediately after the standardized screen task. The study will evaluate changes in objective and subjective measures of visual fatigue, ocular behavioral parameters, and dry eye-related indicators. These include critical flicker fusion frequency, visual fatigue questionnaire scores, eye movement, blinking and pupil parameters, tear film-related measurements, conjunctival redness, and dry eye symptom scores. Safety will be assessed by recording any discomfort or adverse events, such as glare discomfort, eye dryness, tearing, conjunctival redness, headache, nausea, or dizziness.

This study is expected to provide clinical evidence on whether full-spectrum screen bar lighting can help reduce screen-related visual fatigue and dry eye symptoms, and may support the development of lighting strategies for visual health in daily screen-use environments.

Tipo di studio

Interventistico

Iscrizione (Stimato)

112

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Cina
    • Guangdong
      • Guangzhou, Guangdong, Cina, 510060
        • Zhongshan Ophthalmic Center

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto

Accetta volontari sani

Sì

Descrizione

Inclusion Criteria:

  1. Age 18 to 35 years, male or female.
  2. Average daily electronic screen exposure of at least 4 hours.
  3. Near visual acuity at 40 cm of 0.5 or better, and able to complete the study 1. tasks and measurements stably.
  4. Able and willing to provide written informed consent.

Exclusion Criteria:

  1. Presence of ocular inflammation or ocular disease.
  2. History of severe systemic disease, neurological disease, or psychiatric disorder.
  3. Pregnancy or lactation.
  4. Use of dry eye or visual fatigue treatments, or contact lens wear, within 1 month before the study.
  5. History of ocular surgery within the past 6 months.
  6. Daily use of lenses with blue-light blocking, photochromic, polarized, filtering, or similar optical functions.
  7. Professional background in ophthalmology or optical products.
  8. Intake of caffeine or other stimulants within 4 hours before the study.
  9. Best-corrected visual acuity (BCVA) less than 0.8.
  10. Anisometropia of 1.00 diopter or greater, or astigmatism of ±2.00 diopters or greater.
  11. Intraocular pressure (IOP) less than 5 mmHg or greater than 21 mmHg.
  12. Non-invasive tear breakup time (NIBUT) less than 5 seconds in either eye.
  13. Ocular Surface Disease Index (OSDI) score of 33 or greater.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Prevenzione
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Separare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Full-Spectrum Screen Bar Lighting
Participants assigned to this arm will complete an approximately 2-hour standardized screen task in a controlled laboratory environment using a full-spectrum screen bar light (MB23001032H-1B) as task lighting. The screen task may include computer-based text processing, screen reading, or viewing specified video materials. Task content, duration, and completion requirements will be kept consistent with the control arm.
Dispositivo: Full-spectrum screen bar light
The 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.
Comparatore placebo: Brightness-Matched Control
Participants assigned to this arm will complete the same approximately 2-hour standardized screen task in the same controlled laboratory environment without using a full-spectrum screen bar light or any additional screen bar lighting. Screen brightness will be adjusted to match the brightness condition of the full-spectrum screen bar lighting arm. Task content, duration, and completion requirements will be kept consistent with the experimental arm.
Altro: Brightness-matched screen task without screen bar lighting
Participants 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.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Change in Critical Flicker Fusion Frequency
Lasso di tempo: Baseline and immediately after completion of the approximately 2-hour standardized screen task
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.
Baseline and immediately after completion of the approximately 2-hour standardized screen task

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Change in Computer Vision Syndrome Questionnaire Score
Lasso di tempo: Baseline and immediately after completion of the approximately 2-hour standardized screen task
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.
Baseline and immediately after completion of the approximately 2-hour standardized screen task
Change in EyeFatigue Tracker Ocular Behavioral Parameters
Lasso di tempo: Baseline and immediately after completion of the approximately 2-hour standardized screen task
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.
Baseline and immediately after completion of the approximately 2-hour standardized screen task
Change in Keratograph 5M Ocular Surface Assessment
Lasso di tempo: Baseline and immediately after completion of the approximately 2-hour standardized screen task
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.
Baseline and immediately after completion of the approximately 2-hour standardized screen task
Change in Eye Dryness Score on the 0-100 Visual Analog Scale
Lasso di tempo: Baseline and immediately after completion of the approximately 2-hour standardized screen task
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.
Baseline and immediately after completion of the approximately 2-hour standardized screen task

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Zhongshan Ophthalmic Center, Sun Yat-sen University

Pubblicazioni e link utili

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Pubblicazioni generali

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Stimato)

20 luglio 2026

Completamento primario (Stimato)

31 dicembre 2026

Completamento dello studio (Stimato)

31 dicembre 2026

Date di iscrizione allo studio

Primo inviato

9 luglio 2026

Primo inviato che soddisfa i criteri di controllo qualità

9 luglio 2026

Primo Inserito (Effettivo)

15 luglio 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

22 luglio 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

20 luglio 2026

Ultimo verificato

1 luglio 2026

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • SIT2026005

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

NO

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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