Today’s optical illusion is challenging people to find a hidden "25" among a grid of "22" and "55." This brain teaser plays on pattern recognition, making it difficult to spot the odd number. So are ...

Age-related macular degeneration may cause a gradual reduction in your central vision over time, so you might not recognize AMD at first.

Scottish scientists from the NeurEye research team have found that photographs taken of the retina at the back of the eye can ...