Inexpensive Five-Minute Retinal Scan Predicts Brain Damage in Multiple Sclerosis

Summary: A quick, low-cost retinal scan can reliably assess brain damage and indicate disease progression in people with multiple sclerosis (MS), according to two studies led by researchers at Johns Hopkins University. Using optical coherence tomography (OCT) and advanced analysis software, investigators measured retinal layers and found strong correlations between eye changes and brain inflammation, atrophy, and clinical disability.

Eye as a Window to the Brain

Peter A. Calabresi, M.D., professor of neurology at Johns Hopkins University School of Medicine and principal investigator on the studies, emphasizes that the retina offers a direct, noninvasive window into central nervous system health. The OCT scan takes about five minutes, uses no ionizing radiation, and costs a fraction (about one-tenth) of a brain MRI. With new software co-developed by the team, researchers can quantify previously difficult-to-measure retinal layers, providing an accessible biomarker for MS-related neurodegeneration and inflammation.

Key Findings from the Studies

Two complementary papers, one in The Lancet Neurology and one in the Archives of Neurology, evaluated different retinal layers and followed patients over time.

• In the study published in The Lancet Neurology, investigators tracked 164 people with MS and 60 healthy controls over four years. They measured thickness and swelling in the inner nuclear layer of the retina and compared these findings to brain MRI measures of inflammation and standard clinical disability assessments. Increased retinal inflammation and swelling correlated with more inflammatory lesions on brain MRI, supporting the retinal scan as a reliable surrogate marker for central nervous system inflammation.
• The Archives of Neurology study examined 84 MS patients and 24 controls, focusing on the ganglion cell layer + inner plexiform layer (GCL+IPL) and the peripapillary retinal nerve fiber layer (pRNFL). Greater thinning in these neuronal layers strongly correlated with gray matter atrophy in the brain—an indicator of irreversible neurodegeneration and greater neurological impairment.

Clinical and Research Implications

These findings have immediate and practical implications. Clinicians could use retinal OCT as an inexpensive, objective tool to monitor MS progression and to help inform treatment decisions. For example, pronounced retinal thinning suggesting advanced atrophy might prompt consideration of more aggressive therapy or enrollment in clinical trials before further irreversible damage occurs.

Because the retina contains unmyelinated neurons, the strong association between retinal neuronal loss and brain atrophy raises important questions about MS pathophysiology. Historically, MS has been characterized as an immune attack primarily against myelin. The retinal results suggest that immune mechanisms may target other components of the nervous system in addition to myelin. Clarifying what the immune system attacks could open new therapeutic avenues and help explain why current treatments are only moderately effective for some patients.

Not a Standalone Diagnostic Tool—Yet

While OCT shows clear value as a monitoring and prognostic tool, Calabresi cautions that retinal scans are not yet sufficient for primary diagnosis of MS. However, some retinal findings—such as microcystic macular edema, which the team observed in 10 patients—are unusual in young, non-diabetic individuals and could warrant further neurological evaluation when detected.

Scope and Impact

In the United States, roughly 400,000 people live with MS. The condition most commonly begins between ages 20 and 50 and affects women two to three times more frequently than men. Because neurodegeneration can progress silently for years, a simple, repeatable retinal measure that reflects global central nervous system pathology could be a valuable addition to clinical practice and research.

Research Team and Support

Key collaborators on the Lancet study included Shiv Saidha, M.B.B.Ch., MRCPI; Elias S. Sotirchos, M.D.; Mohamed A. Ibrahim, M.D.; Ciprian M. Crainiceanu, Ph.D.; Yasir J. Sepah, M.B.B.S.; John N. Ratchford, M.D.; Jiwon Oh, M.D.; Scott D. Newsome, D.O.; and Quan D. Nguyen, M.D., among others. Contributors to the Archives of Neurology paper included several of the same investigators plus Daniel S. Reich, M.D., Ph.D.

Both studies received funding from the National Multiple Sclerosis Society, the National Eye Institute (grants RO1 EY014993 and RO1 EY019473), and the Braxton Debbie Angela Dillon and Skip (DADS) Donor Advisor Fund.

Contact and Source Information

Contact: Stephanie Desmon, Johns Hopkins Medicine

Source: Johns Hopkins Medicine news release summarizing the peer-reviewed research.

Original research citations (for reference)

Microcystic macular oedema, thickness of the inner nuclear layer of the retina, and disease characteristics in multiple sclerosis: retrospective study. The Lancet Neurology, November 2012, Volume 11, Issue 11, Pages 963–972. DOI: 10.1016/S1474-4422(12)70213-2

Relationships Between Retinal Axonal and Neuronal Measures and Global Central Nervous System Pathology in Multiple Sclerosis. Archives of Neurology, online October 2012. DOI: 10.1001/archneurol.2013.573