Fleischer ring

Fleischer ring
Fleischer ring in keratoconus, by Mahmoud et al., 2022.
Differential diagnosiskeratoconus

Fleischer rings are pigmented rings in the peripheral cornea, resulting from iron deposition in basal epithelial cells, in the form of hemosiderin. They are usually yellowish to dark-brown, and may be complete or broken. The rings are best seen using the slit lamp under cobalt blue filter.

They are named for Bruno Fleischer.

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