Editing Intraocular pressure (section)

==Classification==
Current consensus among [[ophthalmologists]] and [[optometrists]] defines normal intraocular pressure as that between 10 [[mmHg]] and 20 mmHg.<ref>[http://www.webmd.com/hw/lab_tests/hw201323.asp webMD - Tonometry]</ref><ref>[http://www.emedicinehealth.com/articles/14545-1.asp Glaucoma Overview] {{Webarchive|url=https://web.archive.org/web/20080704200634/http://www.emedicinehealth.com/articles/14545-1.asp |date=4 July 2008 }} from eMedicine</ref><ref name="Hashemi-Mohammad2015">{{cite journal |vauthors = Hashemi H, Kashi AH, Fotouhi A, Mohammad K |title = Distribution of intraocular pressure in healthy Iranian individuals: the Tehran Eye Study |journal = Br J Ophthalmol |volume = 89 |issue = 6 |pages = 652–7 |date = June 2005 |pmid = 15923494 |pmc = 1772663 |doi = 10.1136/bjo.2004.058057}}</ref><ref name="Pooranee2015">{{cite web |author=Pooranee |title=Do you know about Intra Ocular Pressure? |website=Health Education Bureau, Information and Communication Technology Agency, Sri Lanka |date=2015-10-09 |url=http://www.healthedu.gov.lk/web/index.php?option=com_content&view=article&id=96%3Ado-you-know-about-intra-ocular-pressure&catid=17%3Aspecial-article&lang=en |access-date=2015-11-04 |archive-date=22 March 2017 |archive-url=https://web.archive.org/web/20170322013535/http://www.healthedu.gov.lk/web/index.php?option=com_content&view=article&id=96%3Ado-you-know-about-intra-ocular-pressure&catid=17%3Aspecial-article&lang=en |url-status=dead }}</ref> The average value of intraocular pressure is 15.5 mmHg with fluctuations of about 2.75 mmHg.<ref name=Janunts>{{Cite web|url=http://www.uniklinikum-saarland.de/de/einrichtungen/kliniken_institute/experimentelle_ophthalmologie/forschung/iop_sensing/|title=Optical remote sensing of intraocular pressure by an implantable nanostructured array|author=Janunts E|work=Medizinische Fakultät der Universität des Saarlandes|url-status=dead|archive-url=https://web.archive.org/web/20120425132825/http://www.uniklinikum-saarland.de/de/einrichtungen/kliniken_institute/experimentelle_ophthalmologie/forschung/iop_sensing/|archive-date=2012-04-25}}</ref>

[[Ocular hypertension]] (OHT) is defined by intraocular pressure being higher than normal, in the absence of [[optic nerve]] damage or [[visual field]] loss.<ref name="Vieira">{{cite journal | vauthors = Vieira GM, Oliveira HB, de Andrade DT, Bottaro M, Ritch R | title = Intraocular pressure variation during weight lifting | journal = Arch. Ophthalmol. | volume = 124 | issue = 9 | pages = 1251–4 | date = September 2006 | pmid = 16966619 | doi = 10.1001/archopht.124.9.1251  | s2cid = 32361659 | doi-access =  }}</ref><ref>[http://www.aoa.org/patients-and-public/eye-and-vision-problems/glossary-of-eye-and-vision-conditions/ocular-hypertension?sso=y Ocular Hypertension], [[American Optometric Association]]. Accessed 2015-11-3.</ref>

Ocular hypotension, hypotony, or [[ocular hypotony]], is typically defined as intraocular pressure equal to or less than 5 mmHg.<ref name="MedscapeOcularHypotony">{{cite web | title=Ocular Hypotony: Background, Pathophysiology, Epidemiology | website=Medscape Reference | date=2014-02-05 | url=http://emedicine.medscape.com/article/1207657-overview#showall | access-date = 2015-11-04}}</ref><ref name="Henderer">{{cite journal | vauthors = Henderer JD, Budenz DL, Flynn HW, Schiffman JC, Feuer WJ, Murray TG | title = Elevated intraocular pressure and hypotony following silicone oil retinal tamponade for complex retinal detachment: incidence and risk factors | journal = Arch. Ophthalmol. | volume = 117 | issue = 2 | pages = 189–95 | date = February 1999 | pmid = 10037563 | doi = 10.1001/archopht.117.2.189 | doi-access =  }}</ref> Such low intraocular pressure could indicate fluid leakage and deflation of the eyeball.