This is How to Avoid Cataracts

The world's leading cause of blindness is cataracts. Cataracts occur when the lens of the eye becomes clouded. Responsible for letting light rays to pass onto the retina, the lens is a transparent structure mostly made up of water and protein fibers. When those fibers clump together, the lens loses its clarity, leading to blurred vision and, if left untreated, complete blindness.
Preventing Cataracts Naturally

Reducing your exposure to ultraviolet light, abstaining from cigarette-smoking, and limiting alcohol consumption all can help protect against cataract development. Here are three other possible ways to reduce your cataract risk naturally.

Fill Up on Antioxidants
In a 2008 study of 35,551 women, researchers found that those who consumed the most lutein and zeaxanthin (antioxidants found in yellow or dark-green leafy vegetables) had an 18% lower chance of developing cataracts than those who consumed the least amount of lutein and zeaxanthin.

In addition to helping absorb harmful ultraviolet light, antioxidants can help stop damaged lens-fiber proteins from clumping together and causing cataracts.

Get Your Omega-3 Fatty Acids

Known to fight inflammation, omega-3 fatty acids can help shield your eyes from cataract development, according to a 2005 study. Looking at data on 71,083 women, the study's authors discovered that those with a higher intake of omega-3s (found in oily fish like salmon and sardines, as well as in flaxseed) had a reduced risk of cataracts.

Consider Herbal Medicine

Animal-based research has shown that bilberry (an herb rich in antioxidants) and turmeric (an anti-inflammatory compound found in the curry spice turmeric) can help prevent the development of cataracts.
Causes and Symptoms

In most cases, lens fibers clump together due to aging-related deterioration. However, cataracts can also develop in younger individuals due to eye injuries, eye diseases, or inflammation.

Cataract symptoms include:

    Blurred or dim vision
    Loss of distance vision
    Sensitivity to light
    Frequent changes in eyeglass or contact lens prescription
    Difficulties with night vision
    Tendencies to see a halo or glare around lights
    Double vision in one eye
    Loss of depth perception

It's important to note that cataracts tend to develop slowly and cause no pain. Since early detection is key to keeping cataracts in check, people ages 65 and older should get their eyes examined at least once every other year.

Using Alternative Medicine
Due to the limited research, it's too soon to recommend alternative medicine for cataract prevention or treatment. It's important to note that self-treating a condition and avoiding or delaying standard care may have serious consequences. If you're considering using alternative medicine, make sure to consult your physician first.

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Our eyes have natural night vision mode

Our eyes have in-built night vision mode, say scientists who found that to see under starlight and moonlight, the retina changes both the software and hardware of its light-sensing cells. Retinal circuits that were thought to be unchanging and programmed for specific tasks are adaptable to different light conditions. However, scientists have now identified how the retina reprograms itself for low light.

“To see under starlight, biology has had to reach the limit of seeing an elementary particle from the universe, a single photon,” said an assistant professor. The findings, published in the journal  show that the reprogramming happens in retinal cells that are sensitive to motion. Even in the best lighting, identifying the presence and direction of a moving object is key to survival for most animals.

However, detecting motion with a single point of reference does not work very well. So, the retinas of vertebrates have four kinds of motion-sensitive cells, each specifically responsive to a motion that is up, down, right or left. In humans, these directional neurons account for about 4 percent of the cells that send signals from the retina to the brain.

In a study with mouse retinas conducted under a microscope equipped with night vision eye pieces in a very dark room, researchers found that the retinal cells sensitive to upward movement change their behaviour in low light. The ‘up’ neurons will fire upon detecting any kind of movement, not just upward.

When there is much less light available, a weak signal of motion from the ‘up’ neurons, coupled with a weak signal from any of the other directional cells can help the brain sense movement. The loss of motion perception is a common complaint in human patients with severe vision loss. The Dr. said this finding about the adaptability of retinal neurons may help the design of implantable retinal prosthetics in the future.

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BANANAS GOOD FOR HEALTH

Scientists develop easier test for blindness

Scientists claim to have developed a quick and accurate test 

for one of the world’s leading causes of blindness.

Researchers from Australia’s Vision Centre demonstrated the 

test under lights for age-related macular degeneration (AMD) 

- one of the world’s leading causes of blindness.

A new study shows that age-related macular degeneration 

(AMD) can be just as effectively and more rapidly and 

inexpensively diagnosed under bright lights, instead of 

requiring patients to sit for 20 minutes in a darkened room.

While current tests for AMD are done in the light, scientists 

have proposed that it might be better if the patient has their 

vision adapted to the dark prior to the test.

This is because they had found that rod receptors - vision 

cells that we use to see in black and white and in low light - 

die earlier in AMD than the cone receptors we use to see in 

colour during the day. So it had been suggested that AMD 

tests would be more accurate if they were based on the 

health of a person’s rods.

Recent research, however, has shown that the eye’s cones, 

while dying later than rods, start to deteriorate at the same 

time as the ‘night vision’ cells.

Using the True-Field Analyser, researchers tested how pupils 

respond to images on LCD screens.

The scientists found little to no difference in the results - with 

the True-Field Analyser, we could diagnose AMD just as well 

regardless of how much light the eyes were exposed to during 

the test.

Our research indicates that it’s not necessary for people to be 

dark-adapted, which eliminates any long waiting periods and 

the need for dark rooms. So it is an easier test than was 

previously thought, researchers said.

WHY BANANAS ARE GOOD FOR HEALTH?