Glaucoma remains one of the leading causes of irreversible blindness worldwide, with global prevalence projected to exceed 110 million by 2040. Despite advances in diagnostics and therapeutics, intraocular pressure (IOP) reduction remains the only proven strategy to slow disease progression. However, a growing body of evidence suggests that lifestyle modifications may play a meaningful adjunctive role in glaucoma care – targeting both IOP-dependent and independent mechanisms.
A recent systematic review highlights the potential for interventions spanning diet, exercise, stress management, and sleep to influence glaucoma outcomes. While none of these approaches replace conventional therapies, they may offer additive benefits that are clinically relevant.
Exercise and ocular perfusion
Among lifestyle factors, physical activity demonstrates some of the most consistent evidence. Moderate aerobic exercise – such as walking, cycling, or swimming – can reduce IOP acutely by up to 3–5 mmHg, with sustained reductions of around 1–3 mmHg reported over longer periods. Mechanistically, exercise appears to enhance ocular perfusion, improve endothelial function, and upregulate neurotrophic factors such as brain-derived neurotrophic factor (BDNF), supporting retinal ganglion cell survival. Importantly, clinicians should exercise caution with certain isometric or Valsalva-inducing activities, which may transiently elevate IOP, particularly in hypertensive patients.
Diet, nutrition, and neuroprotection
Nutritional factors also appear to influence both glaucoma risk and progression. Diets rich in leafy green vegetables, nitrates, and antioxidants (vitamins A, C, and E) have been associated with reduced incidence of primary open-angle glaucoma and slower visual field loss. These effects are thought to arise from improved vascular function and reduced oxidative stress – key contributors to optic nerve damage. Emerging evidence also supports a role for specific supplements, including flavonoids and nitric oxide precursors, which may modestly reduce IOP and enhance trabecular outflow.
Mind-body interventions and stress pathways
Psychological stress is increasingly recognized as a modifiable risk factor in glaucoma. Stress-related biochemical changes – such as elevated cortisol levels and systemic inflammation – may contribute to IOP fluctuations and optic nerve vulnerability. As such, mindfulness-based interventions, including meditation and controlled breathing techniques, have been shown to reduce IOP while also improving quality of life and reducing anxiety. These approaches may exert their effects through modulation of the hypothalamic–pituitary–adrenal axis and inflammatory pathways.
Sleep, smoking, and systemic health
Sleep quality and systemic health behaviors further intersect with glaucoma pathophysiology. Treatment of sleep apnea has been linked to slower visual field progression, likely through improved nocturnal oxygenation. Similarly, smoking cessation is also associated with reduced rates of retinal nerve fiber layer thinning, underscoring the already well-documented vascular and oxidative burden of tobacco use.
Integrating lifestyle into clinical care
Taken together, these findings from the systematic review support a more holistic approach to glaucoma management. Even modest, sustained reductions in IOP can translate into meaningful reductions in progression risk. Equally important are the non-IOP benefits, including improved ocular perfusion, reduced oxidative stress, and enhanced patient well-being.
For ophthalmologists, the practical implication is clear: lifestyle counselling should be considered part of routine glaucoma care. Encouraging patients to adopt a plant-rich diet, engage in regular aerobic exercise, manage stress through mindfulness techniques, optimize their sleep, and avoid smoking may not only complement medical and surgical treatments, but also empower patients in the long-term management of their disease.
