Research Shows Link Between Diet and Glaucoma Management

What a person eats can impact the management of glaucoma, potentially influencing the amount of medication needed to control the debilitating eye condition.

Health researcher, Genesis Edokpa, makes the link between the foods people consume and how they influence the severity of glaucoma, in his paper, titled ‘Association Between Diet and Number of Prescribed Medications in Glaucoma Patients’.

It was presented at the Ministry of Health and Wellness’ 16th Annual National Research Conference held earlier this year at The Jamaica Pegasus hotel in New Kingston.

Mr. Edokpa, who is based at the Caribbean Institute for Health Research (CAIHR) at the University of the West Indies (UWI), Mona, noted that glaucoma, which is one of the leading causes of irreversible blindness worldwide, disproportionately impacts Afro-Caribbean populations, who are six to eight times more likely to develop the disease than their Caucasian counterparts.

Glaucoma is primarily characterised by increased intraocular pressure that damages the optic nerve over time, gradually resulting in irreversible vison loss.

In clinical practice, the main goal is to reduce that pressure, typically through medicated eye drops or surgery.

However, as Mr. Edokpa explains, there are up to six classes of glaucoma medications, and patients may require multiple drugs simultaneously when one proves insufficient.

“The number of medications used can serve as a proxy for how severe or difficult the disease is to control,” he pointed out.

It is this reality that has driven curiosity about alternative or complementary approaches, and whether lifestyle choices, particularly diet, can make a difference.

While previous studies have suggested that certain foods may influence glaucoma risk, Mr. Edokpa points out a critical gap – no research had directly examined the relationship between dietary habits and the number of medications required to manage the condition.

To address this, the researcher conducted a cross-sectional study involving 109 patients diagnosed with primary open-angle glaucoma, the most common form of the disease.

Participants were recruited from the University Hospital of the West Indies, and a private ophthalmology practice in Kingston.

Using a detailed health and lifestyle questionnaire, the study assessed both the number of prescribed medications and dietary intake over a three-month period.

Foods were grouped into 10 categories ranging from cereals and starchy staples to vegetables, fruits, fish, and beverages like coffee and tea.

Participants reported how frequently they consumed each item and in what portion sizes, allowing researchers to estimate average daily intake.

The analysis also accounted for a range of other factors such as age, gender, hypertension, diabetes, physical activity, and medication adherence that could influence disease severity.

Initial findings revealed little association between most food groups and medication use, except for fish and vegetable consumption.

The research found that higher consumption of fish and vegetables was significantly linked to a lower amount of prescribed glaucoma medications.

Mr. Edokpa said that the explanation likely lies in the biological properties of these foods. Fish, particularly varieties like sardines, tuna, and mackerel are rich in omega-3 fatty acids, which have been shown to help reduce intraocular pressure.

Vegetables, especially leafy greens such as callaloo, pak choy, spinach, and kale, contain nitrates and antioxidant vitamins that support improved fluid outflow in the eye, also contributing to lower pressure levels.

These findings suggest that diet may play a supportive role in managing glaucoma, potentially easing the treatment burden for patients.

However, Mr. Edokpa was careful to emphasise that the results indicate association, not causation.

“Nutrition does not cure glaucoma but it may complement the traditional methods of treatment,” he said.

The study also carried several limitations. Its cross-sectional design means it cannot establish cause-and-effect relationships, and the relatively small sample size limits generalisability.

Additionally, dietary intake was measured using self-reported questionnaires, which can be prone to inaccuracies. To strengthen future research, Mr. Edokpa informed that biological samples have already been collected and stored at the CAIHR for more objective analysis, pending funding.

Beyond its scientific contribution, the study resonates on a practical level. In a region where glaucoma is both prevalent and devastating, the possibility that simple dietary adjustments could reduce disease burden is both empowering and accessible. It offers patients a sense of agency, something they can control alongside prescribed treatments.

Mr. Edokpa’s work also opens the door for further exploration, including how combinations of foods might interact and whether dietary impacts differ by gender or other demographic factors.

As research continues, the integration of nutrition into clinical guidance could become a valuable addition to glaucoma care.

The takeaway is clear. While eye drops and surgery remain essential, the dinner plate may also have a role to play.

For patients navigating the challenges of glaucoma, that insight could prove to be both hopeful and transformative.