Biological Fiber Optics in the Eye

While we usually pigeonhole mitochondria as the “powerhouse of the cell,” in the retina of the eye, they pull double duty as high-tech optical hardware. They are tiny biological magnifying glasses. In your eyes, these organelles have a secret second job. Instead of just making energy, they line up in a perfect row to act as microlenses. Usually, light can scatter and get a bit “blurry” inside the eye, but these mitochondria catch the light and funnel it straight to the cells that see color.

It’s like having millions of tiny flashlights helping you see the world in high definition. Your eyes are basically using their own batteries to sharpen your vision! Essentially, your eyes repurpose energy-producers to act as biological fiber optics.

Ball, J. M. (2022). Science Advances, 8(9). DOI: 10.1126/sciadv.abn2070.