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Eye aging is responsible for a host of health problems

Yellowing of the lenses and narrowing of the pupil lead to disruption of the biological clock
Eye aging is responsible for a host of health problems

New York: Lori Tanbark *
For decades, scientists have been searching for explanations for symptoms that accompany aging, such as memory loss, slow reactions, insomnia and depression, and have studied a number of reasons they suspect such as high cholesterol, obesity, heart disease and an inactive lifestyle. However, a large number of remarkable research has now found a cause for an unknown period for a long time: the aging of the eye, where the gradual yellowing of the lenses and the narrowing of the pupil, which accompanies age, causes a disorder in the circadian rhythm of the body, which It contributes to a number of health problems, according to these studies.
Eye aging
* The older the eye, the less sunlight will enter through the lenses into the main cells of the retina, which regulate the circadian rhythm of the body.
"We believe the effect is significant, and it is the beginning of an audit of eye aging as a problem," says Patrick Turner, an ophthalmologist in Lea wood, Kansas. Turner and her husband Martin Minster, a professor of ophthalmology at the University of Kansas School of Medicine, have co-authored many literature on the effects of eye aging on health.
The circadian rhythms of the body are the hormonal and physiological processes that the body mobilizes every morning to meet the requirements of the day and slows them at night to allow the body to rest. This internal clock relies on light to work well, and studies have shown that people with asynchronous circadian rhythms - such as workers who change shift shifts - are at risk of a number of diseases, including insomnia, heart disease, and cancer.
"The process of evolution has built this beautiful timekeeping mechanism, but the inner clock is not completely tuned and needs to be pushed every day," said David Pearson - whose lab at Brown University is studying how the eye communicates with the brain.
Melanin
* The cells called the light receptors in the retina absorb sunlight and send messages to a part of the brain called the schismatic nucleus nucleus, known simply as the "SCAN", which controls the internal clock. The supra uterine nucleus adapts the body to the environment by starting to release melanin in the evening and cortisol in the morning.
Melanin is believed to perform a lot of health-supporting functions. And studies have shown that people with low secretion rates of melanin - a sign of dysfunction in the supra-secondary nucleus - have higher rates of infection with many diseases, such as cancer, diabetes and heart disease.
Eye and biological clock
* The role of the eye in the synchronization of the circadian rhythm was not discovered until 2002, and we always believed that the layer of sticks and cones was the only optical receptors in the eye, but Pearson's team discovered that cells in the inner retina are called “retinal ganglion cells” It also contains photo receptors, and these cells communicate more directly with the brain.
It turns out that these vital cells are responsive to the blue part of the light spectrum. This discovery, as well as other ramifications, raised questions about our exposure to energy efficient light bulbs and electronic devices that emit a significantly blue light.
Blue light is also part of the spectrum that aging eye lenses filter. In a study published by the British Journal of Ophthalmology, Minster and Turner said: When a person reaches 45 years of age they receive light receptors that have 50% of the light needed to fully stimulate the biological clock system. And when a person reaches his fifty-fifth year this percentage drops to 37%, and then to only 17% when a person reaches his seventy-fifth year.
"Anything that affects the intensity of light or the wavelength may have dire consequences for the synchronization of the circadian rhythm, which in turn may have effects on all types of physiological processes," Pearson said.
Many of the studies that were conducted mostly in European countries indicated that these effects are not only theoretical. Women at the age of fifty. Studies have found that the amount of blue light that significantly impeded melanin in young women had absolutely no effect on melanin in elderly women.
"This assures us that the same amount of light that makes a young person sit in the morning, feel awake, and has a good ability to retain his memory and feel a better mood, has no effect on older people," Turner says.
Another study, published in the journal "Biological Rhythms", discovered that after exposure to blue light, the alertness increased, the feeling of drowsiness decreased and the mood improved for young people, while the elderly did not feel any of these effects.
Researchers from Sweden studied some patients who underwent cataract surgery to remove their dark lenses and implanted lenses more clearly inside the eyes, and the researchers discovered a significant decrease in the incidence of insomnia and drowsiness during the day, while another study discovered improved reaction times after the cataract operation.
"We believe that it will become clear that cataract surgery increases melanin levels, and that patients who have undergone this surgery will be less likely to have health problems such as cancer and heart disease," Turner says.
This is the reason why Minster and Turner asked about widespread practice in cataract surgery, as a third of the lenses that are implanted inside the eye in the world are lenses that block blue rays in order to reduce the risk of oracular degeneration by reducing exposure to light that might cause damage.
However, there is no compelling evidence that cataracts have a greater risk of oracular degeneration. Some experts say that there is increasing evidence that the body needs blue light.
"You can always wear sunglasses, but if you are in a good environment, this is not appropriate," said Minster. You can take off these glasses to enable the biological watch to do a better job, but you cannot remove the filters if they have been permanently implanted in your eyes. ”
Minster and Turner believe that because of these light-changing changes, with age, people must make an effort to expose themselves to bright sunlight or bright indoor light if they cannot go outside. Older people are especially vulnerable, as they spend a lot of time indoors.
"In modern societies, we spend most of our time in an environment controlled by artificial lights - 1,000 or 10,000 times darker than sunlight, and to the wrong part of the spectrum," Turner says. Minster and Turner did maneuvers and installed additional fluorescent lights in their offices to help off the aging of their eyes. * The New York Times service

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