Wednesday, May 4, 2011

Tanda mata bermasalah

Mata adalah pancaindera yang sangat penting, sebab itu ia perlu dijaga dengan sebaik-baiknya. Sesetengah orang memandang ringan dan menganggap enteng kalau ada sedikit masalah berkaitan mata. Menurut pakar, walaupun mata hanya mempunyai masalah kecil, tetapi jangan sekali-kali diabaikan, mana tahu masalah itu akhirnya menjadi besar sehingga sukar untuk diubati.
Oleh itu, tanda-tanda awal yang menunjukkan seseorang itu mempunyai mata yang bermasalah perlu diketahui supaya tindakan awal dapat dilakukan sebelum terlewat.
Berikut dipanjangkan maklumat tentang tanda-tanda awal seseorang itu menghadapi masalah mata dan tips tentang cara-cara untuk mengatasinya….
Warning Signs of Eye Trouble
Reviewed by Louise Chang, MD

Blurry vision, spots, glare at night — these are common eye complaints that can be harmless annoyances or an early sign of disease. In the slides ahead, we explore several eye problems and offer two quick eye tests. You’ll see the world through eyes that have floaters, cataracts, myopia, and glaucoma. Be sure to see an eye doctor promptly for any concerns.
Color Blindness Test
Which number do you see in the far left? If it’s “3,” you probably have normal color vision. If it’s a “5,” you may be colorblind. This view is simulated in the center panel and represents a mild color vision deficiency. About 10% of men are born colorblind, but few women. Complete color blindness (very rare) is simulated at right. No number is visible. Tinted glasses may help the colorblind see better.
Nearsightedness (Myopia)
About 33% of Americans (ages 12-54) have a blurry view of distant objects, called myopia, up from about 25% in the early 1970s. Risk factors include:
* Family history (one or both parents)
* Lots of prolonged, close-up reading

Trouble with driving, sports, or seeing a blackboard or the TV may ensue. Symptoms include headaches, squinting, and fatigue. Myopia can be treated with glasses, contacts, or surgery in some cases.
Farsightedness (Hyperopia)
Most of us are born with mild farsightedness, but normal growth in childhood often corrects the problem. When it persists, you may see distant objects well, but books, knitting, and other close objects are a blur. Hyperopia runs in families. Symptoms include trouble with reading, blurry vision at night, eyestrain, and headaches. It can be treated with glasses, contacts, or surgery in some cases.
Just like gray hair or wrinkles, trouble reading fine print is a sign of aging. Called presbyopia — or “old eye” in Greek — symptoms appear in the 40s. The eyes’ lenses become less flexible and can’t change shape to focus on objects at reading distance. The solution: Reading glasses or bifocals, which correct both near and distance vision. If you wear contacts, one eye can be corrected for reading and the other for distance.
Nearsightedness: What Happens
Typically, an eyeball that’s too long causes myopia. But an abnormally shaped cornea or lens can also be to blame. Light rays focus just in front of the retina, instead of directly on it. This sensitive membrane lines the back of the eye (seen in yellow) and sends signals to the brain through the optic nerve. Nearsightedness often develops in school-age children and teens, who need to change glasses or contacts frequently as they grow. It usually stabilizes by the early 20s.
Farsightedness: What Happens
In hyperopia, the cause is often an eyeball that is too short. Light rays focus behind the retina, causing close objects to be blurry. An abnormal shape in the cornea or lens can also lead to farsightedness. Children with significant hyperopia are more likely to have crossed eyes (strabismus) and may have difficulty reading. That’s why experts recommend vision screening for young children.
Your vision may be out of focus at any distance with an astigmatism in one or both eyes. It occurs when the cornea, the clear “window” that covers the front of the eye, is misshapen. Light rays can be scattered in different points on the retina, rather than focusing on a single point. Glasses or contact lenses correct the problem, and surgery may be another option. Symptoms include headaches, fatigue, and eye strain.
Refractive Eye Surgery
Do you dream of seeing clearly without glasses? Surgery to reshape the cornea can correct nearsightedness, farsightedness, or astigmatism with a success rate of better than 90%. People with severe dry eye, thin corneas, or severe vision problems may not be good candidates. Possible side effects include glare or sensitivity to light.
Glaucoma: View

You can’t feel it, but rising pressure in the eye can silently steal your sight, a condition called glaucoma. There may be no symptoms until some peripheral vision is lost, so regular eye exams are critical to find it early. Those at higher risk include:
* African-Americans over 40.
* Anyone over 60, especially Mexican-Americans.
* People with a family history.

Fortunately, glaucoma can be treated with medications or surgery. Regular eye exams every 1-2 years after age 40 can catch it early.
Glaucoma: What Happens
In the most common form of glaucoma, too much fluid builds up inside the eye. That increases pressure and damages the optic nerve at the back — the bundle of 1 million nerve fibers that carry information to the brain. Without treatment, glaucoma can cause total blindness.
The bright yellow circle shows an optic nerve head that is damaged by glaucoma. The dark central area is the macula, responsible for finely-detailed central vision.
Macular Degeneration: View
Age-related macular degeneration (AMD) damages, then destroys, the eye’s finely-detailed central vision, making it difficult to read or drive. Symptoms can include a central blurry spot or straight lines that appear wavy. Finding and treating AMD promptly can help slow vision loss. Being over 60, smoking, high blood pressure, obesity, and a family history of AMD increase your risk.
Macular Degeneration: What Happens
In AMD, the central part of the retina, called the macula, deteriorates. In the dry form, doctors often see yellow deposits called drusen in the macula. As dry AMD progresses, the macular tissue deteriorates, gradually shutting down the delivery of images to the brain. In the wet form, abnormal blood vessels grow. They leak blood and fluid (seen here), causing scarring and further damage to the macula. Both types lead to a central blind spot.
Macular Degeneration: Test
Cover one eye and stare at the center dot in this Amsler Grid, from a distance of 12 to 15 inches. (You can wear your reading glasses.) Do you see wavy, broken, or blurry lines? Are any areas distorted or dark? Repeat the procedure for your other eye. While no self-test can substitute for an eye exam, this grid is used to help detect early symptoms of AMD.
Macular Degeneration:Signs
As seen here, the Amsler Grid can look quite distorted to someone with significant macular degeneration and may include a central dark spot. Straight lines that appear wavy are also cause for concern, as they can be an early symptom of “wet” AMD, the more serious and fast-moving type of macular degeneration. Your eye care professional will want to evaluate you right away, starting with a thorough dilated eye exam.
Diabetic Retinopathy: View
Type 1 and type 2 diabetes can cause partial vision loss (seen here) and lead to blindness. The damage involves tiny blood vessels in the retina and can often be treated, but don’t wait for symptoms. By the time they occur — blurry vision, spots, shadows, or pain — the disease may be severe. Exams of the retina every 1-2 years can detect early warning signs. The best prevention is keeping your blood sugar in check.
Diabetic Retinopathy: What Happens
When high blood sugar levels go unchecked, it can damage the tiny blood vessels that support the retina. These blood vessels can swell, break, and leak fluid. In some cases, dozens of new, abnormal blood vessels grow, a condition called proliferative retinopathy. The abnormal vessels are very fragile and break open easily. These processes gradually damage the retina, causing blurred vision, blind spots, or blindness.
Cataracts: View
Age is not kind to our eyes. By the time we’re 80 years old, more than half of us will have had a cataract, or clouding of the lens. Vision gradually gets foggy and makes it hard to read, drive, and see at night. Diabetes, smoking, or prolonged sunlight exposure may increase the risk. Surgery that replaces the clouded lens with an artificial lens is highly effective.
Cataracts: What Happens
In good health, the lens focuses light into a sharp, clear image on the retina, which captures the image like film in a camera. As we age, protein builds up in the lens, clouding it, and sending scattered rays of light to the retina, instead of one sharp clear image. The result can be blurred vision, changes in color vision, and glare, especially at night. Advanced cataracts are visible to the naked eye — the muddy-colored circle at the center of this picture.
Retinitis Pigmentosa
RP is an inherited disorder that often begins with night vision problems, followed by a gradual loss of side vision, developing into tunnel vision, and finally, in some cases, blindness. One in 4,000 American have RP. A promising study showed that high-dose vitamin A supplements can reduce vision loss. However, you should consult a health care expert before taking supplements because too much vitamin A can be toxic.
Retinitis Pigmentosa: What Happens
The light-sensitive tissue of the retina slowly deteriorates over many years in people with RP. As this tissue dies, it stops sending signals to the brain, and some vision is lost. Eye exams show abnormal dark spots (pigments) sprinkled around the retina, called bone spicules. Early cataracts can also occur, as well as a swelling of the retina called macular edema (the central orange mass seen here).
Floaters and Specks
Blurry spots or specks that move may be floaters — debris in the eye’s vitreous gel. They don’t block vision and are more easily seen in bright light. Floaters are common and usually harmless. But if they change suddenly, or are accompanied by light flashes, you should see a doctor. Vision abnormalities that tend to be more serious include persistent white or black spots and a sudden shadow or loss of peripheral vision. These require immediate evaluation.
Ambylopia (Lazy Eye)
When vision is reduced in one eye, the brain sometimes favors the other eye. This condition, called ambylopia, may stem from a misalignment of the eyes (strabismus or crossed eyes) or poorer vision in one eye. A patch or drops that blur the vision in the “good” eye can prod the brain to use the other eye. If untreated, amblyopia can persist into adulthood.
Eye Care: Object in the Eye
Many nerve endings lurk just beneath the surface or your cornea, so a tiny speck can be surprisingly painful. Don’t rub the eye, or you may cause serious damage. Gently flushing the eye with lukewarm water is often recommended. If it doesn’t dislodge the foreign body, or you have any questions, call a medical provider. She can remove the object and provide antibiotic drops to protect the cornea from infection.
Eye Care: Tears and Dry Eye
Tears are the lubrication for our eyes. When not enough flow, perhaps due to dry air, aging, or other health conditions, the eyes can become painful and itchy. Eye drops labeled artificial tears may do the trick, but some people will need other medication or a procedure to unplug the tear ducts.
Eye Care: Pinkeye
Pinkeye, or conjunctivitis, is an inflammation caused by a virus, bacteria, irritant, or allergy. Along with the telltale redness, you might have an itching or burning sensation and a discharge. Most cases are viral, which don’t require antibiotics. Bacterial conjunctivitis is typically treated with antibiotic eye drops. Both types are very contagious, so wash your hands frequently while you wait for it to clear up.
Eye Care: Stye
A stye is a red bump that looks like a pimple on the edge of the eyelid. It is just one type of infection of the eyelids (blepharitis). Styes usually heal in a week, but using a warm, wet compress three to six times a day can speed the healing. Don’t wear contact lenses or eye makeup until it heals.
Eye Care: Allergies
Millions of people suffer from allergies — and watery, itchy eyes. Pollen, grass, dust, weeds, and pet dander are common triggers. Reduce the allergens in your home with allergen impermeable covers on mattresses and pillows, thorough cleaning, and allergen filters in the furnace and air conditioner. Allergy eye drops, artificial tears, and antihistamines also may soothe the symptoms.
Eye Care: Regular Exams
Everyone should have a thorough eye exam by age 40 or earlier if there is a family history of eye problems. Beyond vision issues, the eyes can reveal underlying health problems, such as diabetes and high blood pressure. Bits of cholesterol may break free from the arteries and lodge in the retina. Abnormalities in an eye exam can help reveal a stroke, brain tumor, or other serious disorder. Bulging eyes are a sign of thyroid disease, and a yellow tint of the sclera (white of the eye) may indicate liver problems.
Eye Protection: Sun

UV rays can damage your eyes, just as they do your skin. Regular overexposure to sun can cause cataracts 8-10 years early, and a single lengthy exposure can actually burn your corneas. The solution is sunglasses that block UV rays and a hat. People with light-colored eyes are likely to have a greater sensitivity to light. More significant light sensitivity — getting headaches or nausea from light exposure — could be a symptom of other eye disorders.
Eye Protection: Everyday Hazards
Grease splatters from a pan, yard debris flies up from the lawn mower, cleaning solution splashes in a bucket. Some of the greatest hazards to the eyes are in the home. The American Academy of Ophthalmology recommends that every household have ANSI-approved protective eyewear. Even if an eye injury seems minor, go to the emergency room immediately to check it out.
Foods for Eye Health
Carrots really are good for your eyes. So are spinach, nuts, oranges, beef, fish, whole grains, many other foods in a healthy diet. Look for foods with antioxidants such as omega-3 fatty acids; vitamins C, E, and beta-carotene; as well as zinc, lutein, and zeaxanthin. Research suggests those nutrients may reduce the risk of age-related macular degeneration.