Julie Poteet, OD, MS, CNS, FOWNS
Discover the role of vitamin B in AMD supplements and download the flowchart outlining the steps of mitochondrial dysfunction in AMD progression.
Age-related macular degeneration (AMD) remains a leading cause of irreversible vision loss and is now understood as a multifactorial disease characterized by oxidative stress, mitochondrial dysfunction, chronic inflammation, and vascular compromise.
The Age-Related Eye Disease Studies (AREDS and AREDS2) established the standard of care for intermediate AMD, demonstrating an approximately 25% reduction in progression to advanced disease with targeted antioxidant and mineral supplementation. 1,2
Increasingly, AMD is recognized as involving cellular energy failure and metabolic stress, with elevated homocysteine emerging as a potentially modifiable risk marker. Together, mitochondrial dysfunction and homocysteine-mediated vascular injury may act upstream of several downstream features of disease, offering an opportunity to expand beyond traditional antioxidant-based strategies.
AREDS/AREDS2: The foundation
AREDS demonstrated that vitamins C and E, beta-carotene, and zinc reduce progression to advanced AMD.1 AREDS2 improved safety by replacing beta-carotene with lutein and zeaxanthin while maintaining efficacy.2
These trials validated nutrition as disease-modifying therapy—but did not address upstream metabolic contributors such as mitochondrial dysfunction or homocysteine dysregulation.
Mitochondrial dysfunction: An early driver
The retina—particularly the retinal pigment epithelium (RPE)—has among the highest metabolic demands in the body.3,4 In AMD, mitochondrial abnormalities include reduced oxidative phosphorylation, increased reactive oxygen species (ROS), mitochondrial DNA damage, and impaired mitophagy.4,5
This results in bioenergetic insufficiency, contributing to RPE dysfunction and photoreceptor loss. Notably, mitochondrial dysfunction is increasingly considered an early initiating event in AMD.5
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Source: eyes on Eyecare