Fleischer ring

{{Distinguish|Kayser–Fleischer ring}}

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|caption = Fleischer ring in keratoconus, by Mahmoud et al., 2022.{{cite journal | last1=Mahmoud | first1=Mohamed Magdy Ibrahim | last2=Hamdy | first2=Alaa Mohamed | last3=Mohamed | first3=Ashraf Bori | last4=Diaa El Din | first4=Yasmine Ahmed | title=An Updated Overview of Keratoconus Management: Review Article | journal=The Egyptian Journal of Hospital Medicine | publisher=Egypts Presidential Specialized Council for Education and Scientific Research | volume=88 | issue=1 | date=2022-07-01 | issn=2090-7125 | doi=10.21608/ejhm.2022.241951 | pages=2777–2780| s2cid=249531881 | doi-access=free }}

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Fleischer rings are pigmented rings in the peripheral cornea, resulting from iron deposition{{cite web |url=http://dro.hs.columbia.edu/fleischer.htm |title=Cornea & External Diseases-Keratoconus Fleischer's Ring |access-date=2008-10-24 |archive-url=https://web.archive.org/web/20090210191314/http://dro.hs.columbia.edu/fleischer.htm |archive-date=2009-02-10 |url-status=dead }} in basal epithelial cells, in the form of hemosiderin.{{cite web |url=http://cancerweb.ncl.ac.uk/cgi-bin/omd?Fleischer%27s+ring |archive-url=https://archive.today/20070813174048/http://cancerweb.ncl.ac.uk/cgi-bin/omd?Fleischer's+ring |url-status=dead |archive-date=2007-08-13 |title=Definition: Fleischer's ring from Online Medical Dictionary |access-date=2008-10-24 }} They are usually yellowish to dark-brown, and may be complete or broken.{{Cite web|date=2021-01-12|title=Fleischer's Ring {{!}} Columbia Ophthalmology|url=https://www.columbiaeye.org/education/digital-reference-of-ophthalmology/cornea-external-diseases/degenerations/fleischers-ring|access-date=2021-01-12|archive-url=https://web.archive.org/web/20210112115950/https://www.columbiaeye.org/education/digital-reference-of-ophthalmology/cornea-external-diseases/degenerations/fleischers-ring|archive-date=2021-01-12}} The rings are best seen using the slit lamp under cobalt blue filter.

They are named for Bruno Fleischer.{{cite journal | author=Fleischer, B | title= Über Keratokonus und eigenartige Pigmentbildung in der Kornea| journal=Münchener medizinische Wochenschrift | year=1906 | volume=53 | pages= 625–626 }}

Fleischer rings are indicative of keratoconus,{{cite journal |vauthors=Hiratsuka Y, Nakayasu K, Kanai A |title=Secondary keratoconus with corneal epithelial iron ring similar to Fleischer's ring |journal=Japanese Journal of Ophthalmology |volume=44 |issue=4 |pages=381–6 |year=2000 |pmid=10974294 |doi= 10.1016/S0021-5155(00)00179-9}} a degenerative corneal condition that causes the cornea to thin and change to a conic shape.