AMD and Environmental Risk Factors
Age-related macular degeneration (AMD) is the leading cause of irreversible vision loss in adults over 65. While genetics and smoking are established risk factors, environmental chemical exposures that affect choroidal vasculature and retinal pigment epithelium function may contribute to AMD progression in the increasingly chemically-exposed older population.
PFAS Accumulation in Retinal Tissue
PFAS have been detected in vitreous humor and chorioretinal tissue in post-mortem studies of occupationally exposed individuals. Long-term PFAS accumulation in retinal pigment epithelium (RPE) cells may impair their phagocytic function for shed photoreceptor outer segments—a critical daily renewal process whose failure precipitates AMD-related photoreceptor degeneration.
Choroidal Vasculature and PFAS Effects
AMD involves impaired choroidal blood flow that reduces oxygen and nutrient delivery to the outer retina. PFAS-induced endothelial dysfunction and pro-inflammatory endothelial activation in choroidal vessels may accelerate the vascular aging component of AMD pathogenesis, particularly in individuals with genetic AMD risk variants.
Ophthalmology Practice Implications
Retinal specialists managing AMD in PFAS-exposed populations should consider chemical burden as a modifiable risk factor alongside smoking cessation and dietary modification. Early AMD surveillance with optical coherence tomography in PFAS-exposed older adults may detect drusen formation and geographic atrophy changes earlier than standard screening timelines