When Vision Fades: A Personal Journey Through LHON, Immune Dysfunction, and Genetic Insight
Leber’s Hereditary Optic Neuropathy (LHON): A Silent Thief of Sight Leber’s Hereditary Optic Neuropathy , or LHON , is a rare genetic condition that causes sudden, painless loss of vision—typically in young adult males. It often starts in one eye and progresses to the other within weeks or months. Central vision becomes blurred or develops a dark spot, though peripheral vision usually remains. Color perception is commonly affected, and while the condition is generally painless, its impact is life-altering. LHON is caused by mutations in mitochondrial DNA (mtDNA) —specifically in genes like MT-ND1, MT-ND4 (most common), and MT-ND6 . Since mitochondria are responsible for cellular energy production, and the optic nerve requires high energy to function, any dysfunction can lead to optic nerve cell death. What makes LHON particularly unique is its maternal inheritance . Mitochondria—and any mutations within them—are passed down from the mother. However, even with the mutation, not ever...