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Author: admin | 15.11.2014 | Category: Ringing In The Ears Causes

Cataracts are a leading cause of blindness worldwide, accounting for nearly half of all blindness globally. With populations of older individuals growing worldwide, this age-related disease has garnered great interest, especially regarding the cause of cataracts. Certain research into the cause of cataracts has demonstrated a link between oxygen exposure and cataract formation, with some studies showing that statins (used to lower blood cholesterol) could have antioxidant effects that counteract the inflammation and oxidative stress that are thought to contribute to the development of cataracts. In addition, eye drops containing acetyl-carnosine reduce the oxidation and glycation damage in the lens by reducing the cristallin cross-linking and could also help prevent cataracts. Cataracts can be classified using a grading system called the Lens Opacities Classification Scheme (LOCS III) which uses three slit lamp images to classify the type of cataract as nuclear, cortisol or posterior.
One new advance in cataract research is an imaging technique called Scheimpflug photography. Wavefront aberrometry is another new technique that can be used to look at abnormalities in the whole eye and whole optical system. This site complies with the HONcode standard for trustworthy health information: verify here.
If the blood is allowed to clot the glucose in the sample gets metabolized by the blood cells unless the cells are separated. To prevent such losses blood samples are collected in Fluoride tubes (ie, gray-top) since fluoride inhibits glycolysis.
Blood sugar is measured at various points of time to give an idea about the body’s blood glucose regulation system.
Other tests include oral glucose tolerance test (OGTT) and intravenous glucose tolerance test (IVGTT) wherein a fixed amount of glucose is administered orally or intravenously respectively and repeated blood sugar tests are performed to check on the body’s glucose handling.
Blood glucose can also be self-monitored by the patient using meters or hand help portable monitors.

Abnormalities of fasting blood glucose is indicative of problems in the multiple control mechanism of glucose regulation. Cataract research has involved studies using animals with induced cataracts as well as human lenses that have been removed from patients.
Furthermore, diets rich in the antioxidants lutein and zeaxanthin have been shown to reduce the risk of developing nuclear cataracts in some studies. This is achieved through comparison of the images with standard photographic transparencies.
This anterior eye segment analysis system can be used to objectively and accurately quantify the intensity and type of cataract.
Previously used in corneal refractive surgery, the imaging technique is now being researched for its clinical use in cataract.
Diabetes indicates persistently high blood sugar that may cause damage to various organs like the kidney, heart, small arteries and the eyes (retina). At refrigerator temperatures, glucose remains relatively stable for several hours in a blood sample. If there are higher numbers of red or white blood cells there is excessive glycolysis in the sample with substantial reduction of glucose level.
Red-top serum separator tubes can also be used for samples after being centrifuged isolating the serum from cells.
After a carbohydrate rich, full meal, two hours are allowed to elapse before blood is taken again for estimation of glucose. This test gives an idea about fluctuations of glucose in blood over a period of last three months. There are other blood compounds like urea that also have reducing properties, this technique may yield faulty results.

Major focuses of interest in cataract research are potential underlying defects in the protein formation and structure of the lens as well as risk factors and control of the disease.
However, both are subjective techniques and an objective reproducible method is needed to standardize the grading system. The advantage of this system is that it can create three-dimensional images of the lens by capturing several static slit images. Blood sample needs to be collected from a different arm other than the one where there is the intravenous line to prevent confusion of the results with the intravenous fluids. The method currently in use, utilizes enzymes specific to glucose and is less likely to yield errors of this kind. This provides sixty images at three-degree intervals around a central axis, helping to show the degree of opacity and its exact location in the lens. Red blood cells have higher concentration of protein than serum and serum has higher water content and more dissolved glucose than whole blood.
Blood glucose normally is lowest early in the morning after 6 to 8 hours of fasting overnight.
Test strip shapes and their exact chemical composition vary between meter systems and cannot be interchanged.

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