A surprising vitamin A discovery is changing what scientists know about vision

Johns Hopkins University researchers discovered that a vitamin A derivative works with thyroid hormones to guide retinal cell development in human vision, challenging a 30-year-old scientific model. Using laboratory-grown human retinal tissue called organoids, scientists found that cells initially sensitive to blue light transform into red and green light-detecting cells during fetal development, creating the specialized arrangement needed for sharp central vision in the foveola. The findings, published in Proceedings of the National Academy of Sciences, could advance treatment research for macular degeneration and glaucoma.