Ophthalmology Times links transient visual loss to stroke

A new ophthalmology paper is a reminder that a brief episode of vision loss may be a vascular warning, not just an eye complaint. A study in the *British Journal of Ophthalmology* found that patients with transient visual loss had higher short- and long-term risks of stroke, major cardiovascular events, myocardial infarction, arrhythmia and hospitalization than matched controls. Ophthalmology Times highlighted the findings on May 22 and said the data support urgent evaluation and longer-term follow-up. The authors were led by Tasha Miller of the Temerty Faculty of Medicine at the University of Toronto. ### How large was the study, and what did it measure? The *British Journal of Ophthalmology* study matched 37,750 patients with a first diagnosis of transient visual loss to 37,750 controls with dry eye syndrome using the TriNetX research network. The authors tracked major adverse cardiovascular events, stroke, myocardial infarction, ventricular arrhythmias, venous thromboembolism, hospitalization and all-cause mortality from 14 days out to 10 years. (ophthalmologytimes.com) The University of Toronto group reported that the transient visual loss cohort had a mean age of 56.8 years and was 59.7% female. Edward Margolin, also of the University of Toronto and its Department of Medicine, was the corresponding author. ### What was the most important risk signal? Within 14 days, stroke risk was 21.7 times higher in patients with transient visual loss than in controls, according to the paper. (bjo.bmj.com) The same window showed nearly 10-fold higher risk for major adverse cardiovascular events, fivefold higher risk for myocardial infarction, more than fourfold higher risk for arrhythmia and nearly fourfold higher risk for hospitalization. The authors also found that the signal did not disappear after the initial episode. Among patients who were event-free at 90 days or one year, elevated long-term risk persisted for as long as 10 years for major adverse cardiovascular events, stroke, arrhythmia and hospitalization. ### Why are eye doctors being told not to be reassured by a normal exam? The North American Neuro-Ophthalmology Society says transient visual loss can be a sign of serious abnormalities of the eye, brain or blood vessels even when vision has returned to normal by the time of examination. (bjo.bmj.com) It says urgent evaluation is necessary when a blood clot is suspected and lists brain MRI, head and neck vessel imaging, bloodwork, heart rhythm testing and echocardiography among the possible tests. The American Academy of Ophthalmology has also said retinal transient ischemic attacks should be treated with the same urgency as cerebral transient ischemic attacks. In an EyeNet clinical update, the academy said transient monocular vision loss of vascular origin has the same mechanisms and systemic implications as cerebral ischemia and called for immediate evaluation and urgent referral when indicated. ### What details from the history matter most? (nanosweb.org) Ophthalmology Times said the study authors urged prompt systemic evaluation within 90 days and careful documentation of the episode. That history includes timing, duration, recurrence, whether the loss was monocular or binocular, and whether neurologic symptoms were present. (aao.org) The reason is that transient visual loss is often gone before a clinician sees it. NANOS says patients may describe complete loss, blurring or a veil-like episode, and the examination may be normal despite a clinically important event. ### Who is most likely to catch these patients first? The American Academy of Ophthalmology said ophthalmologists may underestimate how urgent these cases are, especially because patients often present first to eye care rather than stroke services. (ophthalmologytimes.com) Jonathan D. Trobe of the University of Michigan said retinal transient ischemic attack should be recognized as a warning sign of possible impending stroke, particularly in patients older than 50 or those with conventional vascular risk factors. (nanosweb.org) The paper itself does not set a new guideline, but it gives clinicians a large dataset to cite when arranging referral and follow-up. The study was published online first on December 9, 2025, and appears in the 2026 volume of the *British Journal of Ophthalmology*. (bjo.bmj.com) (aao.org)