GLP-1 medications have become a go-to for managing type 2 diabetes and supporting weight loss, offering benefits like enhanced appetite regulation, insulin release, and even cardiovascular protection. But like any medication, they come with potential side effects, including nausea, fatigue, and muscle loss. That’s why regular check-ins with your primary care provider and consistent strength-training sessions are a must. But there’s another appointment that’s just as important: your eye exam.
“Vision issues can occur when using GLP-1s,” says Jacquie Bowen, OD, president of the American Optometric Association (AOA). “While these complications appear to be rare, patients with diabetes or pre-existing eye conditions may be at higher risk for potentially serious vision problems. The research hasn’t yet pinpointed the cause of these issues, but as more and more people take these medications, we’re definitely seeing an increase in certain conditions.”
This is why the AOA recommends patients get a baseline comprehensive eye exam with an optometrist within one year before starting GLP-1 medications or one month after. Regular follow-up exams are also important, as they give your optometrist a clear point of reference and make it easier to track any changes over time to stay ahead of potential eye complications.
GLP-1s And Vision
Just because you’re taking a GLP-1 medication doesn’t mean you will experience vision-related side effects, but Dr. Bowen says there are a few eye-related conditions worth monitoring with the help of your optometrist.
Diabetic Retinopathy Progression
This diabetes-related complication occurs when high blood sugar damages the blood vessels in the retina, causing them to leak or swell and potentially lead to vision problems or loss. While GLP-1s are effective for managing blood sugar, research suggests the rapid drop in glucose levels may temporarily worsen existing retinopathy in some people.
Ischemic Optic Neuropathy
Characterized by a sudden loss of vision, this rare condition is caused by blocked blood flow to the optic nerve. It’s usually painless, occurs in one eye, and is most common for those with reduced circulation, diabetes, or high blood pressure. One recent study found that higher doses of semaglutide (a type of GLP-1) were associated with this issue, and it was especially pronounced in men.
Dry Eye
True to its name, dry eye is a chronic condition in which the eyes don’t produce enough moisture, leading to irritation, burning, stinging, redness, and blurred vision. It’s often triggered by environmental factors like wind, smoke, or air conditioning. While some research suggests GLP-1s may improve dry eye disease in people with type 2 diabetes, others may find symptoms worsen if they’re dealing with dehydration—a common side effect of GLP-1s due to reduced thirst and issues like diarrhea and slowed digestion.
So how do you know if taking a GLP-1 is impacting your vision? That’s where a comprehensive eye exam comes into play.
Why An Eye Exam Matters
During a comprehensive eye exam, an optometrist evaluates multiple aspects of eye and overall health and can detect more than 270 serious conditions such as high blood pressure, diabetes, autoimmune disorders, and cancer. The AOA notes that this is different from a simple vision screening, as it provides a more thorough assessment of structures within the eye, including the retina, blood vessels and optic nerves, which are a direct extension of the brain. In fact, the interior of the eye is the only place in the body optometrists can directly examine blood vessels and nerve tissue without expensive imaging or invasive procedures.
“We can identify, just by looking into the eye, whether someone is at higher risk for reduced or restricted blood flow,” says Dr. Bowen. These exams are also important, she adds, because many eye conditions have minimal symptoms in their early stages, and sometimes none at all. As with many health conditions, early detection is key to more effective treatment. For example, diagnosing diabetic retinopathy in its early stages can help slow its progression and reduce the risk of long-term vision loss.
The AOA recommends annual, in-person comprehensive eye exams to optimize visual function, evaluate eye changes and provide for the earlier detection of sight-threatening and systemic health conditions. But those at higher risk, including people with diabetes, those taking GLP-1 medications, or others with health conditions that can affect the eyes, should be seen as determined by their optometrist.
“Potential vision issues are not a reason to stop taking GLP-1s or to consider not taking them at all,” says Dr. Bowen. “These are transformative medications that have numerous benefits for many people. However, it’s important to pay attention to the fact that eye health may be affected, which is why making sure you’re staying on track with your annual comprehensive eye exam is crucial.”
If you’re taking a GLP-1, stay informed about the potential effects of the medication on your vision and schedule an in-person eye exam with an AOA doctor of optometry.
