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 ...

Most individuals with color vision deficiency have had it since birth. However, people can develop it later in life. If it develops due to a health problem, color blindness can worsen over time. Color ...

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 ...