No one wants to tell someone they can't drive. America was founded on the pioneer spirit and unless we cramp everyone into urban concrete jungles, which are implicated in any number of health, pollution and crime issues, America's vast expanses mean we are a car culture.

But a diagnosis of hemianopia, blindness in one half of the visual field in both eyes, usually as the result of strokes, tumors or trauma, often means the end of driving. But it isn't required in countries like Belgium, the Netherlands, the UK, Switzerland and Canada if people can pass a specialized road test.

The modern world has a problem. We are undergoing spontaneous mutations caused by radiation, even at low levels. This radiation can break chromosomes into pieces that reattach randomly and sometimes create genes that didn't previously exist.

Actually, that's happening because of nature.  Deep space cosmic rays have been doing that to everything on earth for as long as the planet has existed. Even organic food.

Sensory Substitution Devices (SSDs) use auditory or tactile stimulation to provide representations of visual information and can help the blind "see" colors and shapes.

Users recognize the image without seeing it because the information is transformed into audio or touch signals. But few people in the blind community actually use them because they are cumbersome and unpleasant to use.

There are those among us who are “health blind”, i.e., handicapped at sensing the health signals most of us easily recognize on others around us. They are the color blind. But we at O2Amp can fix that.

1. The Health-Blind Among Us

Despite the presence of modern electronic medical sensing tools, medical personnel still rely on their naked-eye visual skills when examining and judging the symptoms and health of patients (Savin et al. 1997).

When we open our eyes, visual information floods the brain and it interprets what we're seeing. Researchers recently non-invasively mapped this flow of information in the human brain by combining two existing technologies, which allowed them to identify both the location and timing of human brain activity.

They scanned individuals' brains as they looked at different images and were able to pinpoint, to the millisecond, when the brain recognizes and categorizes an object, and where these processes occur. 

When and where

A paper has determined that while people can reliably become aware of changes - visual awareness can extend beyond objects we focus on - that doesn't mean we can identify what has changed.  Their example is that a person might notice a general change in someone's appearance but not be able to identify that the person had had a haircut.  

Lead author Dr. Piers Howe from the Melbourne School of Psychological Sciences said the research is the first to show in a scientific study that people can reliably sense changes that they cannot visually identify. 

A breakthrough in understanding how cataracts form could be used to help prevent the world's leading cause of blindness, which currently affects nearly 20 million people worldwide. 

It has long been known that human eyes have a powerful ability to focus because of three kinds of crystallin proteins in their lenses, maintaining transparency via a delicate balance of both repelling and attracting light.

Two types of crystallin are structural, but the third – dubbed a "chaperone" – keeps the others from clumping into cataracts if they're modified by genetic mutation, ultraviolet light or chemical damage.

What color is H? Is 4 brighter than 9?

Those questions don't make sense to many people but for people with grapheme-color synesthesia, they have real answers.

Women can tell when someone's eyes aren't on her face and are instead looking at her body - because it happens all of the time. Men do it ... and so do other women. At least when they are in college.

The oft-rumored "objectifying gaze" is not just anecdotal evidence, say psychologists who set out to document the nature of roving eyes when it came to women's bodies. A new study employed eyetracking technology to map the visual behavior of college aged men and women as they viewed images of different females with different body types. 

Less than two weeks in space may be enough to cause profound changes in eye structure and gene expression, according to a new report based on a small study.

The study looked at how low gravity and radiation and oxidative damage impacts mice and examines eye-related gene expression and cell behavior after spaceflight, but the subject size was too limited to be conclusive - 18 mice in nine different condition groups, due to limited aboard orbital missions.