Blink Reminders and Meibomian Gland Loss in Digital Screen Users

The Ocular Surface Disease (OSD) in digital display terminal (VDT) users is considered a "lifestyle epidemic" affecting productivity and quality of life. High visual demand imposed by screens leads to a significant reduction in blink frequency and an increase in incomplete blinks. This blinking ineffectiveness results in tear film instability, reflected in a non-invasive tear break-up time (NIBUT) of <10 seconds , and is strongly correlated with Meibomian Gland Dysfunction (MGD), which determines the severity of dry eye in these users.

While standard preventive measures like the "20-20-20 rule" are commonly recommended, evidence regarding their impact on objective morphological parameters of the ocular surface is limited or inconsistent. This study addresses the critical gap in long-term randomized clinical trials (RCTs) evaluating the sustainability of digital behavioral modifications on glandular morphology.

This is a randomized, parallel-group (1:1), open-label clinical trial. Participants will be intensive digital screen users (defined as ≥4 hours per day for at least 3 days a week) aged 18 to 40 years, recruited from the Hospital de la Ceguera (APEC).

Intervention Groups:

Experimental Group: Participants will install the "BlinkEasy" software on their digital devices. The program will display a visual alert approximately 8 times per minute designed to induce complete blinks; participants are instructed to blink twice with each alert. Adherence will be recorded via automated system logs.

Control Group: Participants will receive standard visual hygiene education, including the 20-20-20 rule and basic recommendations on blinking and visual rest.

The primary objective is to evaluate whether active blink reminders reduce the progression of Meibomian gland loss over a 12-week period using infrared meibography (Keratograph 5M) as the primary structural measure. The study hypothesizes that the intervention will reduce the progression of Meibomian gland loss by at least 10-15% of the total glandular area (or ≥0.5 points in meiboscore) compared to the control group. Secondary outcomes include changes in dry eye symptoms (measured by the 12-item OSDI questionnaire) and functional tear film parameters (NIBUT)

Inclusion criteria

• Participants aged 18 to 40 years.
• Intensive digital screen users, defined as an average screen time of ≥4 hours per day for at least 3 days per week.
• Ocular Surface Disease Index (OSDI) score ≥13 (indicating mild to severe symptoms).
• Non-invasive tear break-up time (NIBUT) ≤10 seconds measured by infrared meibography.
• Presence of visible Meibomian glands on baseline meibography, allowing for quantitative analysis.
• Technical ability to install and operate the BlinkEasy software on their primary digital device.

Exclusion criteria

• Active ocular disease, including infections, corneal ulcers, or acute conjunctivitis.
• History of ocular surgery (e.g., refractive surgery, cataract extraction) or significant ocular injury.
• Use of topical ophthalmic medications affecting the ocular surface (e.g., steroids, glaucoma medications, or cyclosporine) within the last 3 months.
• Active use of contact lenses that cannot be suspended for the duration of the 12-week study period.
• Systemic conditions known to affect the ocular surface (e.g., Sjögren's syndrome, Rheumatoid Arthritis).
• Diagnosis of Diabetes Mellitus (Type 1 or Type 2).