Retinal Scan Marker Flags Dangerous Vision Loss
Adults over 50 with sudden vision loss may benefit from knowing this imaging clue can point toward a treatable inflammatory cause.
Updated on Nov. 2, 2026 in Stroke
A multicenter US study published October 23, 2026 in the American Journal of Ophthalmology evaluated whether a retinal finding called paracentral acute middle maculopathy (PAMM) can help identify arteritic anterior ischemic optic neuropathy (AAION), a vision-threatening condition linked to giant cell arteritis. The findings are relevant to adults over 50, the group most affected by these conditions.
Why it matters
AAION is an urgent cause of sudden vision loss because it is tied to giant cell arteritis, a treatable inflammatory condition that requires rapid care. A retinal marker that can be seen on routine imaging could help clinicians sort out which optic nerve injuries need immediate evaluation for the arteritic form.
This diagnostic accuracy analysis drew on 119 patients aged 50 and older, including 27 with AAION and 92 with NAION. PAMM's high specificity but low sensitivity means it is a useful signal when present, yet its absence does not rule out AAION.
The players
American Journal of Ophthalmology
A peer-reviewed journal that publishes clinical and research studies in eye diseases and vision care.
The details
PAMM appears on optical coherence tomography (OCT) as a hyperreflective band centered in the inner nuclear layer, sometimes extending into the outer plexiform layer. It reflects ischemia, or reduced blood flow, in the intermediate and deep retinal capillary plexuses. Giant cell arteritis can compromise blood flow through the ophthalmic and retinal circulations, which may accompany ischemic injury to the optic nerve.
Timeline
January 2020 to January 2025: Patients diagnosed for the study cohort
October 23, 2026: Study published online ahead of print in American Journal of Ophthalmology
Health Landscape
Optic nerve ischemia is typically separated into arteritic and nonarteritic forms, and the nonarteritic form is far more common in this study's population. Adding a retinal imaging marker to clinical evaluation could help prioritize which patients need urgent screening for giant cell arteritis.
Adults over 50 who experience sudden, painless vision loss or other symptoms should seek prompt medical evaluation, since both arteritic and nonarteritic forms require different follow-up. Anyone with a history of giant cell arteritis or related symptoms like scalp tenderness or jaw pain should discuss this possibility with their doctor.
The takeaway
A retinal finding on OCT can be a useful clue for arteritic optic nerve ischemia when present, but it does not exclude the condition. Adults over 50 with sudden vision changes should promptly discuss them with a physician.
Further reading
For related background on blood-flow disorders affecting the brain and eyes, see our Stroke coverage.
