Semaglutide, the active ingredient in Ozempic and Wegovy, has become immensely popular due to its effectiveness in weight loss. However, recent research has revealed that this medication may be linked to a rare eye condition that could lead to blindness.
While this finding might be alarming, experts urge patients not to panic. Here’s an in-depth look at the study’s findings, the risks involved, and the steps to ensure eye health using semaglutide.
The Study and Its Findings
A study published in JAMA Ophthalmology has highlighted a potential link between semaglutide and a rare eye condition known as Non-Arteritic Anterior Ischemic Optic Neuropathy (NAION).
Researchers analyzed the medical records of over 17,000 patients treated at Mass Eye and Ear over six years. Patients were categorized based on their use of semaglutide for diabetes or weight loss and compared with those using other medications for similar conditions.
NAION, the second leading cause of optic nerve blindness, is believed to result from reduced blood flow to the optic nerve head, leading to sudden or gradual vision loss in one eye.
Currently, there are no effective treatments for NAION. The study found that diabetic patients on semaglutide were over four times more likely to be diagnosed with NAION, while those who were overweight or obese had a sevenfold increase in risk.
Understanding the Risks
While the study indicates a potential risk, it’s essential to consider a few caveats. Mass Eye and Ear is a specialized institute that treats many patients with rare eye conditions, possibly skewing the population sample.
Additionally, researchers couldn’t confirm if patients consistently took the medication, which might have influenced their risk.
Dr. Joseph Rizzo, the primary study investigator, emphasizes that the study did not aim to establish causality but to highlight an unusual pattern. “We saw several cases of NAION in close succession, which seemed unusual,” he explains.
The exact mechanism by which semaglutide might cause NAION is still unclear. NAION is caused by a stroke of the optic nerve, making it challenging to predict or prevent.
Medical Experts’ Perspective
Despite the study’s findings, medical professionals are not overly concerned. Dr. Bavand Youssefzadeh, an ophthalmologist, notes that “any medication carries an increased risk of side effects,” and patients taking semaglutide often have underlying conditions like diabetes or obesity, which already increase the risk of eye diseases.
Youssefzadeh points out that NAION remains very rare. He adds that vision changes can occur with weight loss or blood sugar stabilization, common effects of semaglutide.
“When your weight changes or your blood sugar fluctuates, the shape of your eye’s lens can change,” he explains.
Dr. Rizzo also emphasizes that the study found an association, not causation. He hopes it will prompt further research to determine if there is a direct cause-and-effect relationship.
“More information helps in making informed decisions,” he says, urging patients to consider these findings as part of a broader risk-benefit analysis.
Potential Benefits of Vision
Interestingly, semaglutide might also offer benefits for certain eye conditions. Research presented at the American Academy of Ophthalmology’s 2023 meeting found that most adults with diabetes who took semaglutide did not develop diabetic retinopathy. This condition can cause vision loss and blindness.
Those already with diabetic retinopathy did not experience worsening conditions on semaglutide.
However, the AAO warned in 2021 that semaglutide might initially worsen diabetic retinopathy. Yet, uncontrolled diabetes itself is a significant risk factor for various eye diseases, including diabetic retinopathy and glaucoma.
“Overall, these medications should help with diabetic retinopathy because they help lower blood sugar levels and may aid in weight loss,” says Youssefzadeh. He has observed patients showing significant improvement on semaglutide.
Maintaining Eye Health While Using Semaglutide
If you are taking semaglutide or considering it, you can take steps to protect your eye health. Given that vision changes can occur with weight loss or blood sugar fluctuations, it’s advisable to consult an ophthalmologist when starting semaglutide.
“If you notice any changes in vision, especially in the first four to eight months, see your eye care professional,” Youssefzadeh recommends.
Semaglutide can increase the risk of dry eyes and cause vision changes, so your doctor might suggest using artificial tears or updating your glasses prescription.
Additionally, managing other health conditions such as high blood pressure, high cholesterol, and sleep apnea can help reduce the risk of NAION.
Final thoughts
While the link between semaglutide and NAION is concerning, experts advise against panic. The condition remains rare, and the study’s findings should be considered alongside the medication’s benefits.
Regular eye check-ups and proactive management of health conditions can help mitigate risks. Dr. Rizzo says, “I don’t want people to be alarmed by this.” With careful monitoring and professional guidance, patients can continue to benefit from semaglutide while safeguarding their eye health.
