Skip to main content

Glaucoma: Types, Symptoms, Diagnosis And Treatment - alldaygeneric.com

Glaucoma refers to a group of related eye disorders that all cause damage to the optic nerve that carries information from the eye to the brain. Glaucoma usually has few or no initial symptoms.
In most cases, glaucoma is associated with higher-than-normal pressure inside the eye — a condition called ocular hypertension. But it also can occur when intraocular pressure (IOP) is normal. If untreated or uncontrolled, glaucoma first causes peripheral vision loss and eventually can lead to blindness.
According to the American Academy of Ophthalmology, the most common type of glaucoma — called primary open-angle glaucoma — affects an estimated 2.2 million people in the United States, and that number is expected to increase to 3.3 million by 2020 as the U.S. population ages.
And because most cases of glaucoma have few or no early symptoms, about half of Americans with glaucoma don’t know they have it.
In most types of glaucoma, elevated intraocular pressure (IOP) is associated with damage to the optic nerve in the back of the eye.
Glaucoma is the second-leading cause of blindness in the U.S. (behind macular degeneration), and the second-leading cause of blindness worldwide (behind cataracts).

Types Of Glaucoma

The two major categories of glaucoma are open-angle glaucoma (OAG) and narrow angle glaucoma. The “angle” in both cases refers to the drainage angle inside the eye that controls the outflow of the watery fluid (aqueous) that is continually being produced inside the eye.
If the aqueous can access the drainage angle, the glaucoma is known as open angle glaucoma. If the drainage angle is blocked and the aqueous cannot reach it, the glaucoma is known as narrow angle glaucoma.
Variations of OAG include: primary open angle glaucoma (POAG), normal-tension glaucoma (NTG), pigmentary glaucoma, pseudoexfoliation glaucoma, secondary glaucoma and congenital glaucoma.
Variations of narrow angle glaucoma include include acute angle closure glaucoma, chronic angle closure glaucoma, and neovascular glaucoma.
  • Primary open-angle glaucoma. This common type of glaucoma gradually reduces your peripheral vision without other symptoms. By the time you notice it, permanent damage already has occurred.If your IOP remains high, the destruction caused by POAG can progress until tunnel vision develops, and you will be able to see only objects that are straight ahead. Ultimately, all vision can be lost, causing blindness.
  • Acute angle-closure glaucoma. Also called narrow-angle glaucoma, acute angle-closure glaucoma produces sudden symptoms such as eye pain, headaches, halos around lights, dilated pupils, vision loss, red eyes, nausea and vomiting.These signs constitute a medical emergency. The attack may last for a few hours, and then return again for another round, or it may be continuous without relief. Each attack can cause progressively more vision loss.
  • Normal-tension glaucoma. Like POAG, normal-tension glaucoma (also called normal-pressure glaucoma, low-tension glaucoma or low-pressure glaucoma) is a type of open-angle glaucoma that can cause visual field loss due to optic nerve damage. But in normal-tension glaucoma, the eye’s IOP remains in the normal range.Also, pain is unlikely and permanent damage to the eye’s optic nerve may not be noticed until symptoms such as tunnel vision occur.The cause of normal-tension glaucoma is not known. But many doctors believe it is related to poor blood flow to the optic nerve. Normal-tension glaucoma is more common in those who are Japanese, are female and/or have a history of vascular disease.
  • Pigmentary glaucoma. This rare form of glaucoma is caused by clogging of the drainage angle of the eye by pigment that has broken loose from the iris, reducing the rate of aqueous outflow from the eye. Over time, an inflammatory response to the blocked angle damages the drainage system.You are unlikely to notice any symptoms with pigmentary glaucoma, though some pain and blurry vision may occur after exercise. Pigmentary glaucoma most frequently affects white males in their mid-30s to mid-40s.
  • Secondary glaucoma. Symptoms of chronic glaucoma following an eye injury could indicate secondary glaucoma, which also may develop with presence of eye infection, inflammation, a tumor or enlargement of the lens due to a cataract.
  • Congenital glaucoma. This inherited form of glaucoma is present at birth, with 80 percent of cases diagnosed by age one. These children are born with narrow angles or some other defect in the drainage system of the eye.It’s difficult to spot signs of congenital glaucoma, because children are too young to understand what is happening to them. If you notice a cloudy, white, hazy, enlarged or protruding eye in your child, consult your eye doctor. Congenital glaucoma typically occurs more in boys than in girls.

Who Is At Risk?

Open-angle glaucoma is three times more likely to affect African-Americans, compared with non-Hispanic whites in the United States, and blindness from glaucoma is at least six times more prevalent among African-Americans than non-Hispanic whites.
Watch this video that explains what glaucoma is and who is at risk for the disease. Studies also suggest open-angle glaucoma affects Hispanics and Latinos at comparable rates to African-Americans.
And in a study published in 2014 that compared the frequency of two types of open-angle glaucoma — primary open-angle glaucoma (POAG) and normal-tension glaucoma (NTG) — among Filipino and white Americans age 40 and older, researchers found Filipino Americans were more commonly diagnosed with both types of open-angle glaucoma than white Americans (11.9 vs 8.2 percent for POAG; 6.8 vs. 2.5 percent for NTG).
Also, among Filipino Americans diagnosed with open-angle glaucoma, 46.7 percent had the normal-tension variety, whereas only 26.8 percent of whites with open-angle glaucoma had NTG, which can be more challenging to treat than POAG.

Glaucoma Symptoms

Glaucoma often is called the “silent thief of sight,” because most types typically cause no pain and produce no symptoms until noticeable vision loss occurs.
For this reason, glaucoma often progresses undetected until the optic nerve already has been irreversibly damaged, with varying degrees of permanent vision loss.
But with acute angle-closure glaucoma, symptoms that occur suddenly can include blurry vision, halos around lights, intense eye pain, nausea and vomiting. If you have these symptoms, make sure you see an eye care practitioner or visit the emergency room immediately so steps can be taken to prevent permanent vision loss.

Diagnosis, Screening And Tests For Glaucoma

During routine eye exams, a tonometer is used to measure your intraocular pressure, or IOP. Your eye typically is numbed with eye drops, and a small probe gently rests against your eye’s surface. Other tonometers send a puff of air onto your eye’s surface.
An abnormally high IOP reading indicates a problem with the amount of fluid (aqueous humor) in the eye. Either the eye is producing too much fluid, or it’s not draining properly.
Normally, IOP should be below 21 mmHg (millimeters of mercury) — a unit of measurement based on how much force is exerted within a certain defined area.
In Goldmann applanation tonometry (GAT), numbing eye drops are applied and a lightweight probe gently touches the eye to measure eye pressure.
In non-contact tonometry (NCT), a gentle puff of air flattens the center of the cornea briefly to measure eye pressure. No numbing eye drops are needed.
If your IOP is higher than 30 mmHg, your risk of vision loss from glaucoma is 40 times greater than someone with intraocular pressure of 15 mmHg or lower. This is why glaucoma treatments such as eye drops are designed to keep IOP low.
Other methods of monitoring glaucoma involve the use of sophisticated imaging technology — such as scanning laser polarimetry (SLP),optical coherence tomography (OCT) and confocal scanning laser ophthalmoscopy — to create baseline images and measurements of the eye’s optic nerve and internal structures.
Then, at specified intervals, additional images and measurements are taken to make sure no changes have occurred over time that might indicate progressive glaucoma damage.
Visual field testing is a way for your eye doctor to determine if you are experiencing vision loss from glaucoma. Visual field testing involves staring straight ahead into a machine and clicking a button when you notice a blinking light in your peripheral vision. The visual field test may be repeated at regular intervals to make sure you are not developing blind spots from damage to the optic nerve or to determine the extent or progression of vision loss from glaucoma.
Gonioscopy also may be performed to make sure the aqueous humor (or “aqueous”) can drain freely from the eye. In gonioscopy, special lenses are used with a biomicroscope to enable your eye doctor to see the structure inside the eye (called the drainage angle) that controls the outflow of aqueous and thereby affects intraocular pressure. Ultrasound biomicroscopy is another technique that may be used to evaluate the drainage angle.

Glaucoma Treatments

Treatment can involve glaucoma surgery, lasers or medication, depending on the severity. Eye drops with medication aimed at lowering IOP usually are tried first to control glaucoma.
Because glaucoma often is painless, people may become careless about strict use of eye drops that can control eye pressure and help prevent permanent eye damage.
In fact, non-compliance with a program of prescribed glaucoma medication is a major reason for blindness caused by glaucoma.
If you find that the eye drops you are using for glaucoma are uncomfortable or inconvenient, never discontinue them without first consulting your eye doctor about a possible alternative therapy.

This article is thoroughly referenced with Alldaygeneric

Comments

Popular posts from this blog

How to Deal With HIV and AIDS

HIV is one type of virus or infection that affects your immune system. Without treatment, it will get worse over time and destroy your immune system day by day. Untreated HIV destroys blood cell (CD4 T Cells). HIV destroys more CD4 cells and makes more copies of it, which dropdown the human immune system. It means if you have to passe from HIV and you not get treatment, it will harder to fight against HIV. In mostly case, once you get HIV infection, the virus stays in the body for life. First Stage: Acute HIV Infection Most people don’t know the right treatment for HIV. When they have been infected with HIV, in short, the time period they show many symptoms in their body related HIV and it is look like virus illness. Around 2 to 6 weeks after you have gotten the virus its call primary HIV or acute retroviral. The Symptoms Are • Sore Throat • Fever • Tiredness(Fatigue) • Nausea and Vomiting • Aching Muscles You get quick action again HIV then doctors wi

5 Common Food-Drug Interactions | AllDayGeneric.com

Many times we hear from our parents or some elders not to have grapefruit juice if you are taking any cholesterol medications. This is not the only combination of food and drugs which should be avoided, there are so many other combinations too. Grapefruit juice can react with other medications too and similarly many other foods can interact with drugs too. Steve Plogsted, BS, PharmD, BCNSP, CNSC, clinical pharmacist with Nutrition Support Service of Nationwide Children’s Hospital in Columbus, Ohio, tells us about the most commonly reactive five foods that react with other medications. So let’s discuss these foods. 1. GRAPEFRUIT JUICE “Grapefruit juice has the ability to interact with medications in numerous ways,” says Plogsted. One way is to increase the absorption of certain drugs, this is the case with some cholesterol-lowering statins but not with all sort of drugs. MedinePlus recommends you not to have grapefruit juice if you are taking any sort of cholesterol lowering me

What is Diabetes?

Diabetes mellitus is a Situation in which the pancreas no longer Allows sufficient insulin or cells Quit responding to the insulin that is produced so that glucose in the blood cannot be consumed into the cells of the body. People who haven’t encountered it may wonder, “What is diabetes?” Also known as diabetes mellitus, diabetes is the name of a group of diseases in which the body is unable to utilize blood sugar for energy properly. When you eat, food is broken down into a simple sugar called glucose, which quickly enters your bloodstream. Then insulin, a hormone produced by the pancreas, delivers the blood glucose to individual cells, where it's used to power the entire body. The amount of insulin produced is directly proportionate to the amount of glucose in the blood. This allows the body to utilize most of the energy supplied by food. But blood glucose can't power a body unless insulin delivers it to the cells. Since people with diabetes either don't produce