Does Ozempic cause blindness? What a 37-million-person check found
- Claim
- OZEMPIC BLINDNESS?
- Catch
- OBSERVATIONAL
- Verdict
- SMALL SIGNAL,
"Ozempic causes blindness" spread after a small single-clinic report. A much larger retrospective study in JAMA Ophthalmology (2025) examined the data-science network across 14 independent databases: 37.1 million adults with type 2 diabetes, including 810,390 new semaglutide (Ozempic) users, assessed against other antidiabetic medications (empagliflozin, sitagliptin, glipizide, other GLP-1 drugs). Most direct comparisons showed no signal (e.g., vs empagliflozin, sensitive definition: HR 1.44, 95% CI 0.78–2.68). Two analytic designs did find a modest increase: a disease-specific definition flagged higher risk in one comparison (HR 2.27, CI 1.16–4.46), and the self-controlled case-series analysis — comparing each person with their own non-Ozempic periods — showed an incidence-rate ratio of 1.32 (95% CI 1.14–1.54), i.e., about 30% higher. Absolute risk stayed tiny: roughly 14.5 new nonarteritic anterior ischemic optic neuropathy (NAION) cases per 100,000 semaglutide users per year — about 1 in 7,000 people annually.
The catch: this is observational database data, coding can never be perfect, and separate studies (including a large TriNetX cohort) put the increase anywhere from nothing measured early to ~doubling by years 2–4. No regulator has pulled the drug for this. If you take Ozempic, do not stop it over this — talk to your doctor, especially if you have vascular eye risk factors.
SOURCES
- Cai CX, Hribar M, Baxter S, et al. "Semaglutide and Nonarteritic Anterior Ischemic Optic Neuropathy." JAMA Ophthalmol. 2025 Apr 1;143(4):304-314. DOI: 10.1001/jamaophthalmol.2024.6555. PMID: 39976940.
- Hsu AY, Kuo HT, Wang YH, et al. "Semaglutide and NAION Risk Among Patients With Diabetes." JAMA Ophthalmol. 2025 May 1;143(5):400-407. DOI: 10.1001/jamaophthalmol.2025.0349. PMID: 40146102.
Information, not medical advice — medication changes belong with your clinician.
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