Glaucoma is one of the world’s leading causes of permanent blindness. Millions of people are living with the disease, and many do not realize they have it until their vision has already been damaged.
Glaucoma slowly harms the optic nerve, the bundle of nerve fibers that carries visual information from the eye to the brain.
Because the damage usually happens gradually and without pain, people may lose part of their eyesight before they notice any symptoms. Once vision is lost, it cannot usually be restored, making early diagnosis and treatment extremely important.
The most common risk factor for glaucoma is high pressure inside the eye. For many years, treatments have focused on lowering this pressure. Doctors commonly prescribe medicated eye drops, laser therapy, or surgery to reduce pressure and slow the disease.
These treatments help many patients, but they do not work equally well for everyone. Some people continue to lose vision even when their eye pressure is well controlled. This has led scientists to search for new ways to protect the optic nerve directly.
A new study from researchers at the Karolinska Institutet in Sweden suggests that a simple combination of vitamins may offer a new way to slow or even prevent damage to the optic nerve. The findings were published in the journal Cell Reports Medicine.
Although the research has so far been carried out mainly in animals, the results were strong enough that the researchers have already begun testing the treatment in people through a clinical trial.
For several years, scientists have suspected that a substance called homocysteine might contribute to glaucoma. Homocysteine is a natural chemical produced in the body during normal metabolism.
High levels have previously been linked with several health problems, including heart disease. Some earlier studies suggested that people with glaucoma often have higher homocysteine levels, leading researchers to wonder whether it might be causing damage to the optic nerve.
The new research challenges that idea. The team increased homocysteine levels in rats that already had glaucoma but found that this did not make the disease worse.
They also examined information from people with glaucoma and found no evidence that blood homocysteine levels affected how quickly the disease progressed. In addition, people who were genetically more likely to have higher homocysteine levels were not at greater risk of developing glaucoma.
These findings suggest that homocysteine is probably not the cause of glaucoma. Instead, the researchers believe that changes in homocysteine levels may simply be a sign that something else is going wrong inside the retina. The retina is the light-sensitive tissue at the back of the eye that converts light into signals sent to the brain.
According to the researchers, glaucoma may interfere with the retina’s ability to properly use several important vitamins that are needed for healthy metabolism. When these vitamins are not used efficiently, the retina may produce less energy, making the optic nerve more vulnerable to damage over time.
James Tribble, one of the lead authors of the study, explained that the retina may gradually lose its ability to process these vitamins normally. This idea led the researchers to investigate whether providing extra amounts of the vitamins could help protect the nerve cells from damage.
To test this possibility, the team gave laboratory mice and rats with glaucoma a combination of vitamin B6, vitamin B9, also known as folic acid, vitamin B12, and choline. These nutrients all play important roles in normal brain and nerve function and help support healthy metabolism throughout the body.
The results were encouraging. In mice with a slowly developing form of glaucoma, the vitamin combination completely prevented damage to the optic nerve during the study period. In rats with a faster-progressing form of the disease, the supplements significantly slowed the rate of damage.
One of the most interesting findings was that these benefits occurred without lowering pressure inside the eye. This suggests that the vitamins may be protecting nerve tissue through a completely different biological pathway than existing glaucoma treatments.
Because the findings were so promising, the researchers have already launched a clinical trial in Sweden. Patients are currently being recruited through St. Erik’s Eye Hospital in Stockholm. The trial includes people with primary open-angle glaucoma, the most common form of the disease, as well as pseudoexfoliation glaucoma, a type that usually progresses more rapidly.
Although much more research is needed before doctors can recommend these vitamin supplements as a standard treatment, the study offers hope for millions of people living with glaucoma.
If future clinical trials confirm the animal results, the vitamin combination could become an additional treatment used alongside existing therapies rather than replacing them. This approach could help protect vision in patients whose disease continues to worsen despite successful control of eye pressure.
Overall, the research provides a fresh way of thinking about glaucoma. Instead of focusing only on lowering eye pressure, scientists are exploring how improving the health and metabolism of retinal nerve cells might slow the disease.
If confirmed in humans, this simple combination of vitamins could eventually become an affordable and accessible way to help preserve eyesight and reduce the risk of blindness for many patients around the world.
If you care about eye health, please read studies about how vitamin B may help fight vision loss, and MIND diet may reduce risk of vision loss disease.
For more information about eye disease, please see recent studies about how to protect your eyes from glaucoma, and results showing this eye surgery may reduce dementia risk.
The study was published in Cell Reports Medicine.
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