Fleischer rings are pigmented rings in the peripheral cornea, resulting from iron deposition[2] in basal epithelial cells, in the form of hemosiderin.

[4] The rings are best seen using the slit lamp under cobalt blue filter.

[5] Fleischer rings are indicative of keratoconus,[6] a degenerative corneal condition that causes the cornea to thin and change to a conic shape.

Kayser–Fleischer rings are caused by copper deposits in descemet's membrane of cornea, and are indicative of Wilson's disease, whereas Fleischer rings are caused by iron deposits in basal epithelial cells.

One example of a medical condition that can present with Fleischer rings is keratoconus.