A widely used type of blood pressure medicine may be linked to a higher risk of glaucoma, according to research involving more than 427,000 adults in the United Kingdom.
The medicines, called calcium channel blockers, are commonly prescribed to lower high blood pressure and treat some heart conditions. Researchers stress that patients should not stop taking them without speaking to a doctor.
High blood pressure often causes no symptoms, but over time it can raise the risk of heart attack, stroke and kidney disease. Medicines are therefore essential for many patients. Calcium channel blockers help relax blood vessels so blood can flow more easily.
The new research examined whether these medicines might also be connected to glaucoma. Glaucoma is a group of eye diseases that damage the optic nerve, which carries visual information from the eye to the brain. Damage to this nerve cannot be reversed and may eventually cause blindness.
Glaucoma can be difficult to notice in its early stages. Vision often disappears slowly, commonly beginning at the edges of what a person can see. By the time the problem becomes obvious, significant damage may already have occurred.
The study was led by Dr. Alan Kastner of Moorfields Eye Hospital and University College London. Researchers analyzed health information from more than 427,000 UK adults, including 33,175 people taking calcium channel blockers. The findings were published in the journal JAMA Ophthalmology.
People taking calcium channel blockers were more likely to have glaucoma than people who were not using them. The association remained after researchers accounted for factors such as age, lifestyle and existing health conditions. Other major types of blood pressure medicine did not show the same pattern.
This difference is important because it suggests that high blood pressure alone may not explain the result. However, the study was observational, meaning it can identify an association but cannot prove that calcium channel blockers directly cause glaucoma. Other differences between patients could still contribute.
Eye pressure provided another interesting clue. High pressure inside the eye is one of the best-known risk factors for glaucoma because it can gradually damage the optic nerve. However, some people develop glaucoma even when their eye pressure is considered normal.
In this study, people using calcium channel blockers showed glaucoma-related changes without having higher eye pressure. If the association is confirmed, the medicines may affect the eye through another pathway that scientists do not yet understand. More research is needed to discover what that pathway might be.
The findings do not mean that everyone taking a calcium channel blocker will develop glaucoma. These medicines have important benefits, and controlling high blood pressure can prevent life-threatening heart and blood vessel problems. Suddenly stopping a prescribed medicine without medical advice could be dangerous.
Instead, people who are concerned can discuss the findings with their doctor and make sure they receive appropriate eye care. Regular comprehensive eye examinations are especially important for people with other glaucoma risk factors, such as older age or a family history of the disease. Early detection can allow treatment to begin before major vision loss occurs.
Future studies will need to confirm whether the connection is truly caused by calcium channel blockers. Researchers also need to determine whether certain drugs, doses or lengths of treatment carry different risks. Understanding why glaucoma-related changes appeared without increased eye pressure may be particularly important.
For now, the research should be treated as a warning signal rather than proof that these medicines harm the eyes.
Its large number of participants strengthens the finding, but observational data cannot fully separate the effects of a medicine from the health conditions of the people taking it. Clinical research will be needed before treatment recommendations should change.
The practical message is to protect both cardiovascular and eye health. Patients should continue taking prescribed blood pressure medicine unless their doctor recommends otherwise, while keeping up with regular eye examinations when appropriate.
Better evidence may eventually help doctors identify which patients need closer monitoring or a different treatment.
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