Humans develop sharp vision during early fetal development thanks to an interplay between a vitamin A derivative and thyroid hormones in the retina, Johns Hopkins University scientists have found. The ...

An optical illusion is a visual phenomenon where our perception of thinking about an image differs from objective reality. This image is seen as a geometric distortion illusion, where the arrangement ...

Robert J. Johnston Jr., associate professor of biology at Johns Hopkins, holds a petri dish enclosing a retinal organoid grown in his lab. Humans develop sharp vision during early fetal development ...