Your Eyes Could Be Warning You About Heart Health: Signs You Shouldn’t Ignore
While an eye examination cannot diagnose heart disease on its own, changes in the retina can sometimes offer clues about problems affecting the body’s blood vessels.
Most of us think of eye check-ups as something we do only when our vision starts blurring or we need new glasses. Yet the tiny blood vessels at the back of the eye can quietly reveal problems that are building up in the rest of the body, especially the heart and blood vessels.
While an eye examination cannot diagnose heart disease on its own, changes in the retina can sometimes offer clues about problems affecting the body’s blood vessels.
The retina is particularly useful because it contains a network of tiny blood vessels that can be examined directly. Conditions such as high blood pressure and diabetes can damage these vessels over time, potentially leaving visible changes in the eye before a person notices other symptoms.
Dr. Khan lists five warning signs that deserve attention:
Blurred or distorted vision
Blurred or distorted vision is common and can have many causes, ranging from refractive errors to eye conditions. However, sudden or unexplained changes should not simply be dismissed.
“Sometimes changes in vision can signal problems with the blood flow in the retina," says Dr Khan.
Dark spots or floaters
Seeing an occasional floater can be relatively common, particularly as people age. However, a sudden increase in floaters, dark spots or flashes can indicate a retinal problem.
Dr Khan specifically advises paying attention to “an increase in the number of floaters and dark spots", as these can be associated with retinal abnormalities.
A sudden shower of floaters, especially when accompanied by flashes or a dark curtain-like shadow across the vision, requires urgent eye assessment because retinal tears or detachment can threaten sight.
Retinal haemorrhages
During a dilated eye examination, an ophthalmologist can sometimes see tiny areas of bleeding in the retina.
“Small spots of bleeding in the retina may be seen in eye examination," Dr Khan says.
Retinal haemorrhages can occur for several reasons, including diabetes and significantly elevated blood pressure. They are therefore not a diagnosis of heart disease, but they can prompt doctors to investigate the patient’s broader vascular health.
Narrowing of retinal blood vessels
The tiny blood vessels in the retina can undergo structural changes when exposed to persistently elevated blood pressure. According to Dr Khan, narrowing of retinal blood vessels generally cannot be detected without examining the retina, but such changes “could suggest that the person has had high blood pressure for some time".
Research has also explored whether retinal vascular changes can help identify cardiovascular risk. Harvard Health, discussing research published in Nature Biomedical Engineering, reported on artificial-intelligence analysis of retinal images that identified patterns associated with cardiovascular risk. The researchers found that retinal photographs contained information that could help estimate cardiovascular risk, although such technology is not a substitute for established cardiovascular assessment.
Vision loss
“If you suddenly have problems with vision, this is an indication of an emergency situation," Dr Khan says.
Sudden loss of vision in one eye can occur when blood flow to the retina or optic nerve is interrupted. Such events can sometimes be linked to vascular conditions and require urgent evaluation.
“It is critical to keep in mind that these warning signs are not necessarily indicative of heart problems," Dr Khan explains. “They could, however, serve as vital clues regarding your vascular condition."
If an ophthalmologist identifies concerning retinal changes, it may be appropriate to check blood pressure, blood sugar and cholesterol as well. Your eyes may not speak, but they can still send a clear message. Listening to them could protect far more than your sight.