A stereogram optical illusion is a fascinating visual puzzle that hides a 3D image within a 2D pattern. At first glance, it appears to be a random collection of repeating designs or colourful dots.

Impaired vision is one of the most common consequences of a stroke. In rare cases, patients may even lose their ability to perceive depth. Such patients see the world around them as flat, like a ...

It's common knowledge that humans and other animals are able to visually judge depth because we have two eyes and the brain compares the images from each. But we can also judge depth with only one eye ...

People with eyesight disabilities may now have a legitimate excuse for playing video games. A team of researchers, including an Ohio State professor, has developed a video game training method that ...

Sharp vision is essential for artists, write Margaret S. Livingstone, a professor of neurology at Harvard Medical School, and Bevil R. Conway, a junior fellow in the Harvard Society of Fellows. Yet a ...

Form and function in the optical structure of bird eyes / G.R. Martin -- Functional accommodation in birds / F. Schaeffel -- Binocular depth perception / S.A. McFadden -- Sound cues to distance: the ...