This cornea specimen is stained with Perl's stain (Prussian blue). What does it show ? Answer Presence of iron in the epithelium. Prussian blue can be used to identify iron which is stained blue. Name some conditions that can give rise to this appearance? a Answer Hudson-Stahli line seen in the elderly Stocker's line at the head of pterygium Ferry's line at the base of a trabeculectomy bleb Fleischer's ring at the base of cone in keratoconus Iron may also deposit around corneal scar.
