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'''For the WikiDoc page for this topic, click [[Glaucoma|here]]'''
{{Glaucoma (patient information)}}


{{EEL}}
{{CMG}}; '''Assistant Editor(s)-In-Chief:''' Erin E. Lord


{{EJ}}
==Overview==
''Glaucoma'' is a disease in which the [[optic nerve]] is damaged, leading to progressive, irreversible loss of vision. It is often, but not always, associated with increased pressure of the fluid in the eye. It is possible to have increased [[IOP|eye pressure]] without having glaucoma, as well as having glaucoma without increased [[IOP|eye pressure]].


For the WikiDoc page for this topic, click [[Glaucoma|here]]
Glaucoma is the second most common cause of blindness in the United States. There are many types of glaucoma, including:


==What is glaucoma?==
* Open-angle ([[chronic]]) glaucoma
* Angle-closure ([[acute]]) glaucoma
* Low-tension or normal-tension glaucoma
* [[Congenital]] glaucoma
* Secondary glaucoma (including [[Pigment]]ary glaucoma and [[Neovascular]] glaucoma)


'''Glaucoma''' is a disease in which the [[optic nerve]] is damaged, leading to progressive, irreversible loss of vision. It is often, but not always, associated with increased pressure of the fluid in the eye. <ref>[http://www.merck.com/mmhe/sec20/ch233/ch233a.html Merck Manual Home Edition, "Glaucoma"]</ref>
==What are the symptoms of Glaucoma?==
[[Symptom]]s of glaucoma vary greatly, depending on the type of disease present.


Glaucoma is the second most common cause of blindness in the United States. There are four major types of glaucoma:
''Open-angle glaucoma''
* Most people have no [[symptom]]s until they begin to lose [[vision]]
* Gradual loss of [[Peripheral vision|peripheral (side) vision]] (also called [[tunnel vision]])


* '''Open-angle (chronic) glaucoma'''
''Angle-closure glaucoma''
* '''Angle-closure (acute) glaucoma'''
* [[Symptom]]s may come and go at first, or steadily become worse
* '''Congenital glaucoma'''
* Sudden, severe [[pain]] in one eye
* '''Secondary glaucoma'''
* Decreased or cloudy [[vision]]
* [[Nausea]] and [[vomiting]]
* Rainbow-like halos around lights
* [[Red eye]]
* Eye feels [[swollen]]


==What are the symptoms of glaucoma?==
''Low-tension or normal-tension glaucoma''
* Narrowed side vision in people with normal [[IOP|eye pressure]]


==What are the causes of glaucoma?==
''Congenital glaucoma''
* [[Symptom]]s are usually noticed when the child is a few months old
* Cloudiness of the front of the eye
* Enlargement of one eye or both eyes
* [[Red eye]]
* Sensitivity to light
* Excessive [[Tears|Tearing]]


==Who is at risk for glaucoma?==
==What causes Glaucoma?==
The four major types of glaucoma have their own unique causes. However, before reviewing them, a brief overview of the [[anatomy]] of the [[eye]] may be helpful in understanding the causes of this [[disease]]: 


==How to know you have glaucoma?==
The front part of the [[eye]] is filled with a clear fluid called [[aqueous humor]]. This fluid is always being made in the back of the [[eye]]. It leaves the [[eye]] through channels in the front of the [[eye]] in an area called the [[anterior chamber angle]], or simply the angle. Anything that slows or blocks the flow of this fluid out of the [[eye]] will cause [[pressure]] to build up in the [[eye]]. This [[pressure]] is called [[intraocular pressure (IOP)]]. In most cases of glaucoma, this [[pressure]] is high and causes damage to the major nerve in the [[eye]], called the [[optic nerve]].


==When to seek urgent medical care==
More specific causes by each major type of glaucoma are:
 
''Open-angle ([[chronic]]) glaucoma''
* The cause is unknown. An increase in [[eye pressure]] occurs slowly over time. The pressure pushes on the [[optic nerve]] and the [[retina]] at the back of the [[eye]].
* Open-angle glaucoma tends to [[Heredity|run in families]]. Your risk is higher if you have a parent or grandparent with open-angle glaucoma. People of African descent are at particularly high risk for this [[disease]].
 
''Angle-closure ([[acute]]) glaucoma''
* It occurs when the exit of the [[aqueous humor]] fluid is suddenly blocked.
* Dilating [[eye drops]] and certain [[medications]] may trigger an [[acute]] glaucoma attack.
 
''[[Congenital]] glaucoma'''
* It is present at birth and results from the abnormal development of the fluid outflow channels in the eye.
* It is often [[hereditary]] and tends to run in families.
 
''Secondary glaucoma''
* It is caused as [[complication]]s of other medical conditions and/or procedures, including [[eye surgery]], advanced [[cataract]]s, eye injuries, certain eye tumors, and [[uveitis]].
* It can be caused by drugs such as [[corticosteroids]], which are used to treat eye [[inflammation]]s.
** [[Pigment]]ary glaucoma is caused when [[pigment]] from the [[iris]] breaks off, thereby slowing the fluid drainage and blocking the meshwork.
** [[Neovascular]] glaucoma is a severe form of secondary glaucoma that is linked to [[diabetes]].
 
==Who is at highest risk?==
Anyone can develop glaucoma, however some people are at higher risk than others. The most important risk factor for glaucoma is [[ocular hypertension]]. Individuals at a higher risk of developing glaucoma include:<br>
* African Americans over age 40.
* Everyone over age 60, especially Mexican Americans.
* People with a family history of glaucoma.
 
Among African Americans, studies show that glaucoma is:<br>
* Five times more likely to occur in African Americans than in Caucasians.
* About four times more likely to cause blindness in African Americans than in Caucasians.
* Fifteen times more likely to cause blindness in African Americans between the ages of 45-64 than in Caucasians of the same age group.
 
A comprehensive dilated [[eye exam]] can reveal more risk factors, such as:<br>
* High [[IOP|eye pressure]]
* Thinness of the [[cornea]]
* Abnormal [[optic nerve]] [[anatomy]].
 
In some people with certain combinations of these high-risk factors, medicines in the form of [[eye drops]] reduce the risk of developing glaucoma by about half.
 
==Diagnosis==
A comprehensive eye exam is necessary to determine whether a patient has glaucoma. Checking the [[intraocular pressure]] alone ([[tonometry]]) is not enough to [[diagnosis|diagnose]] glaucoma because [[intraocular pressure|eye pressure]] changes. Furthermore, [[IOP|pressure in the eye]] is normal in about 25% of people with glaucoma (normal-tension glaucoma). There are other problems that cause [[optic nerve]] damage.
 
Tests to [[diagnosis|diagnose]] glaucoma include may:
* [[Gonioscopy]] (use of a special lens to see the outflow channels of the angle)
* [[Tonometry]] test to measure [[IOP|eye pressure]]
* [[Optic nerve]] imaging (photographs of the inside of the eye)
* [[Pupillary reflex]] response
* [[Retina|Retinal]] examination
* [[Slit lamp]] examination / [[Mydriasis|Dilated eye exam]]
* [[Visual acuity]]
* [[Visual field]] measurement
* [[Pachymetry]]
 
==When to seek urgent medical care?==
Call your health care provider if you have severe eye [[pain]] or a sudden loss of [[vision]], especially loss of [[peripheral vision]].
 
Call for an appointment with your health care provider if you have risk factors for glaucoma and have not been screened for the condition.


==Treatment options==
==Treatment options==
The goal of treatment is to reduce [[IOP|eye pressure]]. Depending on the type of glaucoma, this is done using medications or [[surgery]].


==Diseases with similar symptoms==
''Open-angle glaucoma treatment''<br>
Most people with open-angle glaucoma can be treated successfully with eye drops. Most eye drops used today have fewer [[side effect]]s than those used in the past. You may need more than one type of drop. Some patients may also be treated with pills to lower [[IOP|pressure in the eye]]. Newer drops and pills are being developed that may protect the [[optic nerve]] from glaucoma damage.


==Where to find medical care for glaucoma==
Some patients will need other forms of treatment, such as a [[laser]] treatment, to help open the fluid outflow channels. This [[procedure]] is usually [[pain]]less. Others may need traditional [[surgery]] to open a new outflow channel.
 
''Angle-closure glaucoma treatment''<br>
[[Acute]] angle-closure attack is a medical emergency. [[Blindness]] will occur in a few days if it is not treated. Drops, pills, and medicine given through a [[vein]] (by [[IV]]) are used to lower pressure. Some people also need an emergency operation, called an [[iridotomy]]. This [[procedure]] uses a [[laser]] to open a new channel in the [[iris]]. The new channel relieves pressure and prevents another attack.
 
''Congenital glaucoma treatment''<br>
This form of glaucoma is almost always treated with [[surgery]] to open the outflow channels of the angle, as medicines may have unknown effects in [[infant]]s and be difficult to administer.
 
===Medications to avoid===
 
{{MedCondContrPI
 
|MedCond = glaucoma|Dicyclomine|Hyoscyamine|Orphenadrine|Phentermine|Scopolamine}}
 
{{MedCondContrPI
 
|MedCond =chronic non-congestive angle-closure glaucoma|Acetazolamide|Atomoxetine}}
 
{{MedCondContrPI
 
|MedCond =narrow-angle glaucoma|Amyl nitrite|Darifenacin|Fesoterodine|Solifenacin|Tolterodine}}
 
==Where to find medical care for Glaucoma?==
[http://maps.google.com/maps?f=q&amp;hl=en&amp;geocode=&amp;q={{urlencode:{{#if:{{{1|}}}|{{{1}}}|glaucoma}}}}&amp;sll=37.0625,-95.677068&amp;sspn=65.008093,112.148438&amp;ie=UTF8&amp;ll=37.0625,-95.677068&amp;spn=91.690419,149.414063&amp;z=2&amp;source=embed Directions to Hospitals Treating glaucoma]
[http://maps.google.com/maps?f=q&amp;hl=en&amp;geocode=&amp;q={{urlencode:{{#if:{{{1|}}}|{{{1}}}|glaucoma}}}}&amp;sll=37.0625,-95.677068&amp;sspn=65.008093,112.148438&amp;ie=UTF8&amp;ll=37.0625,-95.677068&amp;spn=91.690419,149.414063&amp;z=2&amp;source=embed Directions to Hospitals Treating glaucoma]


==Prevention of glaucoma==
==Prevention==
There is no way to prevent ''open-angle glaucoma'', but you can prevent [[vision loss]] from the condition. Early [[diagnosis]] and careful management are the keys to preventing [[vision loss]].
 
Most people with open-angle glaucoma have no [[symptom]]s. Everyone over age 40 should have an [[eye examination]] at least once every 5 years, and more often if in a high-risk group. Those in high-risk groups include people with a family history of open-angle glaucoma and people of African heritage. Such high-risk groups should have a comprehensive [[mydriasis|dilated]] [[eye exam]] at least once every two years.
 
People at high risk for ''[[acute]] glaucoma'' may opt to undergo [[iridotomy]] before having an attack. Patients who have had an [[acute]] episode in the past may have the [[procedure]] to prevent a recurrence.
 
==What to expect (Outlook/Prognosis)?==
Untreated glaucoma leads to permanent damage of the [[optic nerve]] and resultant [[visual field]] loss, which can progress to [[blindness]].


==What to expect (Outlook/Prognosis)==
The outlook of the disease varies by type:<br>
''Open-angle glaucoma''<br>
With good care, most patients with open-angle glaucoma can manage their condition and will not lose [[vision]], but the condition cannot be cured. It's important to carefully and regularly follow up with your doctor.
 
''Angle-closure glaucoma''<br>
Rapid [[diagnosis]] and treatment of an attack is key to saving your [[vision]]. Seek emergency care immediately if you have [[symptom]]s of an angle-closure attack, as [[blindness]] will occur in a few days if it is not treated.
 
''Congenital glaucoma''<br>
Early [[diagnosis]] and treatment is important. If [[surgery]] is done early enough, many patients will have no future problems.


==Sources==
==Sources==
*http://www.nlm.nih.gov/medlineplus/ency/article/001620.htm
*http://www.nei.nih.gov/health/glaucoma/glaucoma_facts.asp


http://www.nlm.nih.gov/medlineplus/ency/article/001620.htm
{{Reflist}}
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[[Category:Patient Information]]
 
[[Category:Opthalmology]]
[[Category:Patient information]]
[[Category:Aging-associated diseases]]
[[Category:Blindness]]
[[Category:Disease]]
[[Category:Ophthalmology]]
[[Category:Emergency medicine]]
[[Category:Mature chapter]]

Latest revision as of 21:52, 29 July 2020

For the WikiDoc page for this topic, click here

Glaucoma

Overview

What are the symptoms?

What are the causes?

Who is at highest risk?

Diagnosis

When to seek urgent medical care?

Treatment options

Where to find medical care for Glaucoma?

Prevention

What to expect (Outlook/Prognosis)?

Glaucoma On the Web

Ongoing Trials at Clinical Trials.gov

Images of Glaucoma

Videos on Glaucoma

FDA on Glaucoma

CDC on Glaucoma

Glaucoma in the news

Blogs on Glaucoma

Directions to Hospitals Treating Glaucoma

Risk calculators and risk factors for Glaucoma

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Assistant Editor(s)-In-Chief: Erin E. Lord

Overview

Glaucoma is a disease in which the optic nerve is damaged, leading to progressive, irreversible loss of vision. It is often, but not always, associated with increased pressure of the fluid in the eye. It is possible to have increased eye pressure without having glaucoma, as well as having glaucoma without increased eye pressure.

Glaucoma is the second most common cause of blindness in the United States. There are many types of glaucoma, including:

What are the symptoms of Glaucoma?

Symptoms of glaucoma vary greatly, depending on the type of disease present.

Open-angle glaucoma

Angle-closure glaucoma

Low-tension or normal-tension glaucoma

Congenital glaucoma

  • Symptoms are usually noticed when the child is a few months old
  • Cloudiness of the front of the eye
  • Enlargement of one eye or both eyes
  • Red eye
  • Sensitivity to light
  • Excessive Tearing

What causes Glaucoma?

The four major types of glaucoma have their own unique causes. However, before reviewing them, a brief overview of the anatomy of the eye may be helpful in understanding the causes of this disease:

The front part of the eye is filled with a clear fluid called aqueous humor. This fluid is always being made in the back of the eye. It leaves the eye through channels in the front of the eye in an area called the anterior chamber angle, or simply the angle. Anything that slows or blocks the flow of this fluid out of the eye will cause pressure to build up in the eye. This pressure is called intraocular pressure (IOP). In most cases of glaucoma, this pressure is high and causes damage to the major nerve in the eye, called the optic nerve.

More specific causes by each major type of glaucoma are:

Open-angle (chronic) glaucoma

  • The cause is unknown. An increase in eye pressure occurs slowly over time. The pressure pushes on the optic nerve and the retina at the back of the eye.
  • Open-angle glaucoma tends to run in families. Your risk is higher if you have a parent or grandparent with open-angle glaucoma. People of African descent are at particularly high risk for this disease.

Angle-closure (acute) glaucoma

Congenital glaucoma'

  • It is present at birth and results from the abnormal development of the fluid outflow channels in the eye.
  • It is often hereditary and tends to run in families.

Secondary glaucoma

Who is at highest risk?

Anyone can develop glaucoma, however some people are at higher risk than others. The most important risk factor for glaucoma is ocular hypertension. Individuals at a higher risk of developing glaucoma include:

  • African Americans over age 40.
  • Everyone over age 60, especially Mexican Americans.
  • People with a family history of glaucoma.

Among African Americans, studies show that glaucoma is:

  • Five times more likely to occur in African Americans than in Caucasians.
  • About four times more likely to cause blindness in African Americans than in Caucasians.
  • Fifteen times more likely to cause blindness in African Americans between the ages of 45-64 than in Caucasians of the same age group.

A comprehensive dilated eye exam can reveal more risk factors, such as:

In some people with certain combinations of these high-risk factors, medicines in the form of eye drops reduce the risk of developing glaucoma by about half.

Diagnosis

A comprehensive eye exam is necessary to determine whether a patient has glaucoma. Checking the intraocular pressure alone (tonometry) is not enough to diagnose glaucoma because eye pressure changes. Furthermore, pressure in the eye is normal in about 25% of people with glaucoma (normal-tension glaucoma). There are other problems that cause optic nerve damage.

Tests to diagnose glaucoma include may:

When to seek urgent medical care?

Call your health care provider if you have severe eye pain or a sudden loss of vision, especially loss of peripheral vision.

Call for an appointment with your health care provider if you have risk factors for glaucoma and have not been screened for the condition.

Treatment options

The goal of treatment is to reduce eye pressure. Depending on the type of glaucoma, this is done using medications or surgery.

Open-angle glaucoma treatment
Most people with open-angle glaucoma can be treated successfully with eye drops. Most eye drops used today have fewer side effects than those used in the past. You may need more than one type of drop. Some patients may also be treated with pills to lower pressure in the eye. Newer drops and pills are being developed that may protect the optic nerve from glaucoma damage.

Some patients will need other forms of treatment, such as a laser treatment, to help open the fluid outflow channels. This procedure is usually painless. Others may need traditional surgery to open a new outflow channel.

Angle-closure glaucoma treatment
Acute angle-closure attack is a medical emergency. Blindness will occur in a few days if it is not treated. Drops, pills, and medicine given through a vein (by IV) are used to lower pressure. Some people also need an emergency operation, called an iridotomy. This procedure uses a laser to open a new channel in the iris. The new channel relieves pressure and prevents another attack.

Congenital glaucoma treatment
This form of glaucoma is almost always treated with surgery to open the outflow channels of the angle, as medicines may have unknown effects in infants and be difficult to administer.

Medications to avoid

Patients diagnosed with glaucoma should avoid using the following medications:


Patients diagnosed with chronic non-congestive angle-closure glaucoma should avoid using the following medications:

  • Acetazolamide
  • Atomoxetine
    If you have been diagnosed with chronic non-congestive angle-closure glaucoma, consult your physician before starting or stopping any of these medications.


Patients diagnosed with narrow-angle glaucoma should avoid using the following medications:


Where to find medical care for Glaucoma?

Directions to Hospitals Treating glaucoma

Prevention

There is no way to prevent open-angle glaucoma, but you can prevent vision loss from the condition. Early diagnosis and careful management are the keys to preventing vision loss.

Most people with open-angle glaucoma have no symptoms. Everyone over age 40 should have an eye examination at least once every 5 years, and more often if in a high-risk group. Those in high-risk groups include people with a family history of open-angle glaucoma and people of African heritage. Such high-risk groups should have a comprehensive dilated eye exam at least once every two years.

People at high risk for acute glaucoma may opt to undergo iridotomy before having an attack. Patients who have had an acute episode in the past may have the procedure to prevent a recurrence.

What to expect (Outlook/Prognosis)?

Untreated glaucoma leads to permanent damage of the optic nerve and resultant visual field loss, which can progress to blindness.

The outlook of the disease varies by type:
Open-angle glaucoma
With good care, most patients with open-angle glaucoma can manage their condition and will not lose vision, but the condition cannot be cured. It's important to carefully and regularly follow up with your doctor.

Angle-closure glaucoma
Rapid diagnosis and treatment of an attack is key to saving your vision. Seek emergency care immediately if you have symptoms of an angle-closure attack, as blindness will occur in a few days if it is not treated.

Congenital glaucoma
Early diagnosis and treatment is important. If surgery is done early enough, many patients will have no future problems.

Sources

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