Near-sightedness, formally known as myopia, occurs when the eye elongates, causing light to focus in front of the retina instead of directly on it, producing blurry vision. Rates of myopia are ...

A seal from the 3rd century B.C. features a bovine creature with one hornImage: Heritage Images/picture alliance The Greek historian Ctesias, who lived during the 5th century B.C., described a sin ...

Many spiders of the species Tegenaria pagana live in caves with limited vision, while others inhabit brighter areas. This variation has drawn scientists to examine how genes guide the development of ...