cataract(causes,signs,symptoms)

cataract
is a condition that develops in the lens of the eye. Cataracts are made of a protein that has been modified from its natural state (denaturation), and eventually stop distorting the light needed to enter the retina, the eye that receives light
other types of cataract?
Secondary cataract. Cataract after surgery to other eye problems such as glaucoma.
Cataracts also can develop in people who have other health problems such as diabetes. Cataracts are sometimes linked to steroid use.
Traumatic cataract. Cataracts can develop after an eye injury, sometimes years later.
Congenital cataract. Some children born with cataracts or develop them in childhood, often in both eyes. These cataracts may be so small that they do not affect vision. If they do, the lenses may need to be removed.
Radiation cataract. Cataracts can develop after exposure to some forms of radiation
Causes and risk factors
The iris and lens after pupil. He works as a camera lens. It focuses light on the retina at the end of the eye, where an image is recorded. The lens also regulates the eyes of the attention, let us see things clearly both near and far. The lens is made mostly of water and protein. Protein is regulated in a way that exact lens clear and allows light through. But as we age, some of the protein group and begin in May of a cloud area small lenses. This is a curtain. Over time, the cataract May grow larger and cloud the lens, making it difficult to see. Researchers suspect that there are several causes of cataract, such as diabetes and smoking. Or it may be that the protein in the lens only by changes in consumption takes years
Who is the risk of cataracts?
The risk of cataract increases as you get older.
Other risk factors for cataract include:
Some diseases such as diabetes. Personal behavior such as smoking and alcohol use.
The environment, such as long-term exposure to sunlight.
Symptoms
The most common symptoms of a cataract are:
Cloudy or unclear vision.
Colors seem faded.
Glare.
Headlights,
LAMPS,
or sunlight may appear too bright.
A halo may appear around lights.
Poor night vision. Double vision or multiple images in one eye. (This clear sign of the May cataract gets larger.) Frequent prescription changes in your eyeglasses or contact lenses. These symptoms could also be a sign of other eye problems. If you have any of these symptoms, contact the Eye Care Professional As a curtain is discovered? Cataract is detected through an exam the first consisting of: Visual acuity test. This eye chart test measures how well you are in different distances. Dilated eye exam. Low are set to expand in your eyes, or dilate, the pupils. Your Eye Care Professional uses a special magnifying lens to your retina and optic nerve for signs of damage and other eye problems. After the examination, your close-up may remain unclear vision for several hours. Tonometry. An instrument measuring the pressure in the eye. Numbing drops may be applied to your eye for this test.