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{{Glaucoma}}
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== Overview ==
Common risk factors include a positive family history, increased age, myopia, diabetes mellitus, hypertension, sleep apnea, thyroid disorders, hypercholesterolemia, migraine, raynaud phenomenon.


== Risk factors==
== Risk factors==
* People with a family history of glaucoma have about a six percent chance of developing glaucoma.
Common risk factors
* [[Diabetic]]s and African Americans are three times more likely than Caucasians to develop primary open angle glaucoma.
*'''Age''':
* Asians are susceptible to angle-closure glaucoma, and Inuit have a twenty to forty times higher risk than Caucasians of developing primary angle closure glaucoma.
**The risk increases with the increase in age.
* Women are three times more likely than men to develop [[acute]] angle-closure glaucoma due to their shallower [[anterior chamber]]s.
**The visual field defects are 7 times more likely to progress in patients above the age 60 years in comparison to those younger than 40 years.
* Use of [[steroid]]s can also cause glaucoma.
**Although an increase in lOP with age has been observed in many populations.
 
**Several studies in Japan have shown a relationship between glaucoma and age even with no increase in lOP in the population.<ref name="Iwase Suzuki Araie Yamamoto 2004 pp. 1641–1648">{{cite journal | last=Iwase | first=Aiko | last2=Suzuki | first2=Yasuyuki | last3=Araie | first3=Makoto | last4=Yamamoto | first4=Tetsuya | last5=Abe | first5=Haruki | last6=Shirato | first6=Shiroaki | last7=Kuwayama | first7=Yasuaki | last8=Mishima | first8=Hiromu K. | last9=Shimizu | first9=Hiroyuki | last10=Tomita | first10=Goji | last11=Inoue | first11=Yoichi | last12=Kitazawa | first12=Yoshiaki | title=The prevalence of primary open-angle glaucoma in Japanese | journal=Ophthalmology | publisher=Elsevier BV | volume=111 | issue=9 | year=2004 | issn=0161-6420 | pmid=15350316 | doi=10.1016/j.ophtha.2004.03.029 | pages=1641–1648}}</ref>
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>
*'''Race''':
* African Americans over age 40.
**The prevalence of POAG is 3-4 times greater in black persons and Hispanic persons as compared to non-Hispanic Caucasian individuals. 
* Everyone over age 60, especially Mexican Americans.
**The loss of vision as a consequence of glaucoma is at least 4 times more common in blacks than in Caucasian population. 
* People with a family history of glaucoma.
**The Baltimore Eye Survey found that the prevalence of glaucoma increases dramatically with age, particularly among black persons, exceeding 11% in those aged 80 years or older.<ref name="Tielsch p=369">{{cite journal | last=Tielsch | first=James M. | title=Racial Variations in the Prevalence of Primary Open-angle Glaucoma | journal=JAMA | publisher=American Medical Association (AMA) | volume=266 | issue=3 | date=1991-07-17 | issn=0098-7484 | doi=10.1001/jama.1991.03470030069026 | page=369}}</ref> 
 
*'''Family History''':
Among African Americans, studies show that glaucoma is:<br>
**A positive family history is a risk factor for POAG. The relative risk of POAG is increased by 3.7-fold for individuals who have a sibling with diagnosed POAG.<ref name="Medscape Reference 2017">{{cite web | title=Primary Open-Angle Glaucoma (POAG) Clinical Presentation: History, Physical, Causes | website=Medscape Reference | date=2017-12-01 | url=https://emedicine.medscape.com/article/1206147-clinical | access-date=2018-03-03}}</ref>
* Five times more likely to occur in African Americans than in Caucasians.
*'''Myopia''':
* About four times more likely to cause blindness in African Americans than in Caucasians.
**The concurrence of POAG and myopia cause difficulty in diagnosis and management of POAG.
* Fifteen times more likely to cause blindness in African Americans between the ages of 45-64 than in Caucasians of the same age group.
**There is an increased difficulty in evaluation of the optic disc is particularly complicated in highly myopic eyes that have tilted discs.
**Myopia-related retinal abnormalities can cause visual field defects along with glaucoma.  
**A high refractive error may also make it difficult to perform accurate perimetric measurement and to interpret visual field abnormalities.
*'''Diabetes Mellitus''':
**The role of [[diabetes mellitus]] in causing POAG is still not clear.  
**Though some studies have found diabetes plays a significant role in the disease, other studies have not found any corelation.<ref name="Klaver p=653">{{cite journal | last=Klaver | first=Caroline C. W. | title=Age-Specific Prevalence and Causes of Blindness and Visual Impairment in an Older Population | journal=Archives of Ophthalmology | publisher=American Medical Association (AMA) | volume=116 | issue=5 | date=1998-05-01 | issn=0003-9950 | doi=10.1001/archopht.116.5.653 | page=653}}</ref>
*'''Hypertension''':
**The systemic [[hypertension]] is associated with a low risk of the presence of glaucoma in younger patients and with an increased risk in patients above 65 years of age.
**With advancing age, the adverse effects of chronic hypertension on the optic nerve microcirculation may lead to  the nerve's susceptibility to the development of glaucomatous optic neuropathy.  
**Some studeis demonstrate that lower ocular perfusion pressure is a strong risk factor for the development of glaucoma, independent of lOP alone.  
**The overtreatment of systemic hypertension may be a contributing factor to glaucoma progression in some cases and hence, should be avoided.<ref name="Klaver p=653">{{cite journal | last=Klaver | first=Caroline C. W. | title=Age-Specific Prevalence and Causes of Blindness and Visual Impairment in an Older Population | journal=Archives of Ophthalmology | publisher=American Medical Association (AMA) | volume=116 | issue=5 | date=1998-05-01 | issn=0003-9950 | doi=10.1001/archopht.116.5.653 | page=653}}</ref>
*'''Retinal vein occlusion''':
**The patients with [[central retinal vein occlusion]] may lead to an elevated lOP and subsequentlu glaucoma.
**In some case, there may be presentation of preexisting POAG or other types of glaucoma. After CRVO, patients may develop angle-closure glaucoma or, at a later stage, neovascular glaucoma.
*'''Sleep apnea'''
*'''Thyroid disorders'''
*'''Hypercholesterolemia'''
*'''Migraine'''
*'''Raynaud Phenomenon'''


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.
==References==
==References==
{{reflist|2}}
{{reflist|2}}
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[[Category:Aging-associated diseases]]
[[Category:Aging-associated diseases]]
[[Category:Blindness]]
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[[Category:Emergency medicine]]
[[Category:Emergency medicine]]
[[Category:Mature chapter]]
[[Category:Mature chapter]]
[[Category:Disease]]
[[Category:Needs overview]]
[[Category:Needs overview]]

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Rohan Bir Singh, M.B.B.S.[2]

Overview

Common risk factors include a positive family history, increased age, myopia, diabetes mellitus, hypertension, sleep apnea, thyroid disorders, hypercholesterolemia, migraine, raynaud phenomenon.

Risk factors

Common risk factors

  • Age:
    • The risk increases with the increase in age.
    • The visual field defects are 7 times more likely to progress in patients above the age 60 years in comparison to those younger than 40 years.
    • Although an increase in lOP with age has been observed in many populations.
    • Several studies in Japan have shown a relationship between glaucoma and age even with no increase in lOP in the population.[1]
  • Race:
    • The prevalence of POAG is 3-4 times greater in black persons and Hispanic persons as compared to non-Hispanic Caucasian individuals.
    • The loss of vision as a consequence of glaucoma is at least 4 times more common in blacks than in Caucasian population.
    • The Baltimore Eye Survey found that the prevalence of glaucoma increases dramatically with age, particularly among black persons, exceeding 11% in those aged 80 years or older.[2]
  • Family History:
    • A positive family history is a risk factor for POAG. The relative risk of POAG is increased by 3.7-fold for individuals who have a sibling with diagnosed POAG.[3]
  • Myopia:
    • The concurrence of POAG and myopia cause difficulty in diagnosis and management of POAG.
    • There is an increased difficulty in evaluation of the optic disc is particularly complicated in highly myopic eyes that have tilted discs.
    • Myopia-related retinal abnormalities can cause visual field defects along with glaucoma.
    • A high refractive error may also make it difficult to perform accurate perimetric measurement and to interpret visual field abnormalities.
  • Diabetes Mellitus:
    • The role of diabetes mellitus in causing POAG is still not clear.
    • Though some studies have found diabetes plays a significant role in the disease, other studies have not found any corelation.[4]
  • Hypertension:
    • The systemic hypertension is associated with a low risk of the presence of glaucoma in younger patients and with an increased risk in patients above 65 years of age.
    • With advancing age, the adverse effects of chronic hypertension on the optic nerve microcirculation may lead to the nerve's susceptibility to the development of glaucomatous optic neuropathy.
    • Some studeis demonstrate that lower ocular perfusion pressure is a strong risk factor for the development of glaucoma, independent of lOP alone.
    • The overtreatment of systemic hypertension may be a contributing factor to glaucoma progression in some cases and hence, should be avoided.[4]
  • Retinal vein occlusion:
    • The patients with central retinal vein occlusion may lead to an elevated lOP and subsequentlu glaucoma.
    • In some case, there may be presentation of preexisting POAG or other types of glaucoma. After CRVO, patients may develop angle-closure glaucoma or, at a later stage, neovascular glaucoma.
  • Sleep apnea
  • Thyroid disorders
  • Hypercholesterolemia
  • Migraine
  • Raynaud Phenomenon

References

  1. Iwase, Aiko; Suzuki, Yasuyuki; Araie, Makoto; Yamamoto, Tetsuya; Abe, Haruki; Shirato, Shiroaki; Kuwayama, Yasuaki; Mishima, Hiromu K.; Shimizu, Hiroyuki; Tomita, Goji; Inoue, Yoichi; Kitazawa, Yoshiaki (2004). "The prevalence of primary open-angle glaucoma in Japanese". Ophthalmology. Elsevier BV. 111 (9): 1641–1648. doi:10.1016/j.ophtha.2004.03.029. ISSN 0161-6420. PMID 15350316.
  2. Tielsch, James M. (1991-07-17). "Racial Variations in the Prevalence of Primary Open-angle Glaucoma". JAMA. American Medical Association (AMA). 266 (3): 369. doi:10.1001/jama.1991.03470030069026. ISSN 0098-7484.
  3. "Primary Open-Angle Glaucoma (POAG) Clinical Presentation: History, Physical, Causes". Medscape Reference. 2017-12-01. Retrieved 2018-03-03.
  4. 4.0 4.1 Klaver, Caroline C. W. (1998-05-01). "Age-Specific Prevalence and Causes of Blindness and Visual Impairment in an Older Population". Archives of Ophthalmology. American Medical Association (AMA). 116 (5): 653. doi:10.1001/archopht.116.5.653. ISSN 0003-9950.

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