I woke up from a nap, on my back, looking up through my bedroom window at a brightly lit blue sky and saw them again: numerous small, uniform dots swimming in my field of view.

This time I paid attention. They went right past the images of floaters in my eye. So they are on a different plane. They moved at what seemed like nearly uniform speeds, although they sometimes went in arced trajectories. Each disappeared individually, sometimes seeming to radiate from a point, acting a bit like sparks in fireworks. They all remained in focus.
 If you have seen a face in the clouds or you have been part of a phenomenon called "pareidolia" - a willingness to recognize a non-face object as a human face.

Humans sometimes perceive an inherently meaningless object such as a pattern, landscape or object as another object, one that has meaning. It's why alternative science proponents, the Jeffrey Smith's and Pete Myers of the world, believe in spirit photographs. 

Some have even argued that pareidolia occurs in relatively low-level visual processing, and a new paper examines the relation between behavior when a face-like object is viewed and brain activity to reveal the level of visual processing at which face-likeness is recognized.

Clark Kent and Superman in the 1940sIn comics, Clark Kent looks a lot like Superman, so similar every child has to wonder why no one puts it together. A pair of glasses on Kent, and a small lock of hair on Superman's forehead, are the only differences.

Yet that's probably enough, according to a new paper. Small alterations to
a person's appearance, such as wearing glasses, can significantly hinder positive facial identification.

Octopuses, squid and other cephalopods are colorblind - their eyes see only black and white - but their weirdly shaped pupils may allow them to detect color and mimic the colors of their background, according to a father/son team of researchers from the University of California, Berkeley, and Harvard University.

For decades, biologists have puzzled over the paradox that, despite their brilliantly colored skin and ability to rapidly change color to blend into the background, cephalopods have eyes containing only one type of light receptor, which basically means they see only black and white.

Nearly half of glaucoma patients don't take their daily prescription eye drops as prescribed, due to forgetfulness or physical limitations like arthritis. However, missing vital doses of glaucoma medication makes these patients vulnerable to increased vision loss and blindness.

A medicated silicone ring that rests on the surface of the eye reduced eye pressure in glaucoma patients by about 20 percent over six months, potentially benefiting 3 million people in the United States who have glaucoma. Phase 2 clinical trial results on this technology were published today and the results are also being presented today at the Ophthalmology Innovation Summit in New Orleans.  

A diet rich in vitamin C could cut risk of cataract progression by a third, suggests a study being published online today in Ophthalmology. The research is also the first to show that diet and lifestyle may play a greater role than genetics in cataract development and severity.

INDIANAPOLIS -- Using stem cells derived from human skin cells, researchers led by Jason Meyer, assistant professor of biology, along with graduate student Sarah Ohlemacher of the School of Science at Indiana University-Purdue University Indianapolis, have successfully demonstrated the ability to turn stem cells into retinal ganglion cells (RGCs), the neurons that conduct visual information from the eye to the brain. Their goal is the development of therapies to prevent or cure glaucoma.

In addition to glaucoma, a group of degenerative diseases that damage the eye's optic nerve and can result in vision loss and blindness, this work has potential implications for treatment of optic- nerve injuries of the types incurred by soldiers in combat or athletes in contact sports.

When you look at the rainbow, what you see is the prism like effect of the mist (aerosolized water droplets) in the air reflecting the sunlight from different portions of the spheres.  These water droplets when suspended in air as mist will all reflect different colors at different angles.  The angle between you, the mist and the sun, will then determine which color is being refracted back to you from each location resulting in a rainbow.  This color is itself a special form of radiation, more specifically it is non-ionizing radiation with very specific wavelengths.

Our vision and hearing aren't as reliable as we might think, according to a new study.

The scholars conducted the research in part because there had never been a comprehensive study to examine whether humans' 'spatial localization' ability -- that is, whether we can immediately and accurately perceive where an object is located -- is as well-honed as we believe it to be. In the study, subjects were asked to sit facing a black screen, behind which were five loudspeakers. Mounted on the ceiling above was a projector capable of flashing bursts of light onto the screen, at the same spots where the speakers were located.

Scholars have found that the causes of congenital face blindness can be traced back to an early stage in the perceptual process.