Effects of Blue of Glasses VS Standard Lenses on Contrast Sensitivity & Visual Fatigue in Myopic & Non-Myopic Adults

The Effects of Blue of Blue Light-blocking Glasses Versus Standard Lenses on Contrast Sensitivity & Visual Fatigue in Myopic & Non-Myopic Adults

This study investigates the effects of blue light-blocking glasses compared to standard lenses on contrast sensitivity and visual fatigue in myopic and non-myopic adults. With the growing use of digital screens, blue light exposure has raised concerns due to potential eye strain, sleep disruption, and visual fatigue.

Study Overview

• Status: Active, not recruiting
• Conditions: Myopia
• Intervention / Treatment: Combination product: Blue Light-Blocking Glasses (Intervention Group); Diagnostic test: Standard Lenses (Control Group)

Detailed Description

While blue light-blocking lenses are marketed to address these issues, evidence of their efficacy, particularly for different refractive errors like myopia, remains inconclusive. Using a randomized controlled design, this study will assess both groups across specific visual tasks to measure contrast sensitivity and visual fatigue. Outcomes are evaluated using validated tools, including the Computer Vision Syndrome Questionnaire (CVS-Q) and Visual Fatigue Questionnaire (VFQ), with measurements taken at baseline, 2 weeks, and 4 weeks. Findings are expected to clarify the potential advantages of blue light-blocking glasses over standard lenses, aiding in evidence-based recommendations for adults with varying visual needs.

• Study Type: Interventional
• Enrollment (Actual): 64
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Pakistan
  • Punjab
    • Taunsa, Punjab, Pakistan
      • Tehsil Headquarters (THQ)

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Adults aged 18-50 years.
• Both myopic (with any degree of myopia) and non-myopic adults.
• Participants who use computer screens for at least four hours per day.
• Individuals currently using corrective lenses or willing to wear study-provided glasses during the experiment.
• Individuals willing to complete the study protocol, which includes attending follow-up examinations and filling out visual fatigue questionnaires.

Exclusion Criteria:

• A history of any serious vision-related condition (such as glaucoma, cataracts, or retinal problems).
• Individuals who have already undergone refractive surgery (e.g., LASIK) or other types of eye surgery.
• Systemic conditions affecting vision include diabetes, neurological problems, and any other ailment that may impair visual ability.
• Taking drugs that are known to impair vision or produce visual tiredness (for example, certain antihistamines and antidepressants).
• Pregnant women's visual performance may be affected by hormonal changes.
• People with uncorrected vision difficulties cannot use the prescription lenses during study time.
• Participants who are allergic or sensitive to lens materials.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Health Services Research
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Control Group	Diagnostic test: Standard Lenses (Control Group); Participants in this arm wore standard lenses without any blue light-blocking properties. These lenses allow the full spectrum of visible light to pass through and serve as a baseline control to measure against the blue light-blocking glasses. Participants used these lenses under the same conditions to assess contrast sensitivity and visual fatigue without blue light filtration.
Experimental: interventional group	Combination product: Blue Light-Blocking Glasses (Intervention Group); Participants in this arm wore blue light-blocking glasses designed to filter out a portion of short-wavelength blue light. These lenses were intended to reduce eye strain and protect against blue light exposure, especially during prolonged screen time. Participants used blue light-blocking glasses consistently throughout the study period to assess their effect on contrast sensitivity and visual fatigue.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Contrast Sensitivity	Measured using the Pelli-Robson chart to assess changes in visual acuity and sensitivity to contrast under different lens conditions.	12 Months
Visual Fatigue	The Visual Fatigue Questionnaire (VFQ) was assessed to evaluate subjective experiences of eye strain and fatigue during visual tasks. Computer Vision Syndrome: Evaluated with the Computer Vision Syndrome Questionnaire (CVS-Q) to quantify symptoms associated with prolonged screen use, including dryness, discomfort, and eye strain."	12 months

Collaborators and Investigators

• Sponsor: Superior University

Study record dates

Study Major Dates

• Study Start (Actual): February 28, 2024
• Primary Completion (Actual): August 1, 2024
• Study Completion (Estimated): January 31, 2025

Study Registration Dates

• First Submitted: December 13, 2024
• First Submitted That Met QC Criteria: December 13, 2024
• First Posted (Actual): March 25, 2025

Study Record Updates

• Last Update Posted (Actual): March 25, 2025
• Last Update Submitted That Met QC Criteria: December 13, 2024
• Last Verified: December 1, 2024

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Eye Diseases; Asthenopia
• Other Study ID Numbers: MSRSW/Batch-Fall22/749

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No