Digital Screen Use and Intraocular Pressure Dynamics: Physiological Mechanisms, Evidence, and Clinical Implications

Abstract

Digital screens have become an inseparable part of modern life, shaping how people learn, work, and communicate. In countries such as India, this transition has been particularly rapid, with increasing screen exposure across children, adolescents, working adults, and even the elderly. What was once occasional use has now evolved into prolonged and often uninterrupted daily engagement. While symptoms of digital eye strain are widely recognized, the deeper physiological effects of sustained screen use, particularly on intraocular pressure (IOP), remain less clearly understood.

Intraocular pressure is a finely regulated parameter determined by the balance between aqueous humor production and outflow, along with influences from episcleral venous pressure, autonomic activity, and circadian rhythms. Even subtle fluctuations in IOP, when repeated over time, may have important implications for individuals at risk of optic nerve damage, especially in a country like India where the burden of glaucoma is substantial and often underdiagnosed.

Digital screen use introduces a unique visual and physiological environment. Prolonged near work demands sustained accommodation and convergence, while intense visual attention reduces blink rate, affecting tear film stability. In addition, commonly adopted postures—such as forward head tilt and neck flexion—may increase episcleral venous pressure, thereby influencing aqueous humor drainage. Exposure to blue-enriched light and continuous cognitive engagement further interact with neurohormonal pathways, potentially altering circadian regulation of intraocular pressure.

Emerging human studies suggest that digital screen use can lead to modest but measurable increases in intraocular pressure, particularly during extended periods of continuous use. Although these changes are generally transient and well tolerated in healthy individuals, their cumulative effect over time remains uncertain, especially in vulnerable populations such as those with glaucoma, ocular hypertension, or high myopia.

Despite growing interest, current evidence remains limited by short study durations and controlled experimental settings. There is a need for long-term, real-world studies to better understand the true clinical significance of these findings.

This review brings together current insights into the physiological mechanisms, available evidence, and clinical implications of digital screen use on intraocular pressure, emphasizing the importance of awareness and simple behavioral modifications in an increasingly digital world.