A new study led by Boston Medical Center researchers indicates a well-known biomarker that serves as a marker for earlier diagnosis of neurodegenerative diseases is now detectable in the eye. Neurofilament light chain, a protein previously detected in cerebrospinal fluid and blood that is being explored as a biomarker to detect neurodegeneration, has now been identified in the vitreous humor, or fluid within the eye. Published in Alzheimer’s Research & Therapy, these results set a foundation for future studies to investigate the potential of this biomarker to accelerate the diagnosis of Alzheimer’s disease, Parkinson’s disease, and other neurodegenerative diseases.