Case 234. Acanthamebic keratitis (44 y-o F)

　 　 　 　
　
Smear preparation of painful ring-shaped keratitis in a contact lens wearer
 　
　 　 　 　

　

 　 A cyst of Acanthamoeba castellani stained by Parker innk-KOH solution. A wrinkled double-layered cyst wall is characteristic. The nucleus is not visible.