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.

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.

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.