Posts Tagged 'eyesight'

Flatworms Can “See” Without Their Heads

NewScientist reports –

Off with their heads. Light-averse planarian flatworms, known for their incredible ability to regenerate lost body parts, shy away from light even after they have been decapitated. This suggests they have evolved a second way to respond to light that doesn’t involve eyes.

Continue reading HERE.

Color Vision Test

paint-chips-sHere is a simple online test for color vision. I don’t know if it is accurate, or if the the science behind it is correct, but it only takes a few minutes and it is game-like. I got 27 with 0 errors, so I’m hawk eyed – beat that!

Take the test HERE.

Color Blind? These Lenses May Help

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Apparently, Encroma lenses are not a cure for color blindness, but for some individuals, they offer some help by enhancing colors.

From their site – With the EnChroma lens, colors appear brighter and more saturated. People report that their color discrimination is faster and more accurate, they are able to see more vibrant colors. They are more likely to notice objects that are differentiated against a background based on color (such as a flower against background of leaves), whereas without the lens those objects would have been overlooked.

Woman Sees 100 Times More Colors Than The Average Person

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From Popular Science –

When Concetta Antico looks at a leaf, she sees much more than just green. “Around the edge I’ll see orange or red or purple in the shadow; you might see dark green but I’ll see violet, turquoise, blue,” she said. “It’s like a mosaic of color.” Antico doesn’t just perceive these colors because she’s an artist who paints in the impressionist style. She’s also a tetrachromat, which means that she has more receptors in her eyes to absorb color. The difference lies in Antico’s cones, structures in the eyes that are calibrated to absorb particular wavelengths of light and transmit them to the brain. The average person has three cones, which enables him to see about one million colors. But Antico has four cones, so her eyes are capable of picking up dimensions and nuances of color—an estimated 100 million of them—that the average person cannot. “It’s shocking to me how little color people are seeing,” she said.

Continue reading HERE.

 

How Birds Really See the World [video]

Chemical Restores Sight In Blind Mice

Wired reports –

Injections of a recently discovered chemical into the eyes of blind lab mice has restored at least part of the rodents’ vision. The chemical, called AAQ — short for acrylamide-azobenzene-quaternary ammonium — was not tested in humans, nor is it a cure for blindness. But researchers who treated mice with the molecule, a type of light-sensitive “photoswitch,” think their method represents an advance in the quest to help the blind see. “The photoswitch is injected into the vitreous cavity of the eye, but unlike the other strategies, it does not require highly invasive surgical interventions and its actions are reversible,” the authors of a new study about AAQ wrote July 26 study in Neuron. “This is a major advance in the field of vision restoration,” said opthamologist Dr. Russell Van Gelder at the University of Washington, Seattle, a co-author of the study. In a healthy eye, light strikes rod- and cone-shaped photoreceptor cells lining the retina, which transmit the signal into a network of nerves below them. Those nerves ultimately usher visual information to the brain. Retinitis pigmentosa and age-related macular degeneration kill off the rods and cones, eventually causing blindness, but the network of nerves behind often remains intact. By taking advantage of the intact nerves, a few biomedical tricks can already partially restore vision. Electronic sensors implanted in a retina, for example, can stimulate the nerves to send visual information when struck by light. Likewise, engineered viruses can implant genes into retinal nerve cells that make them react to light.

Continue reading HERE


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