Foreign Body Localization: The Ring Method

If the foreign body is in the cornea or anterior chamber or on the iris direct clinical examination will reveal its exact position. In other cases the foreign body may be observed in the lens which is as yet transparent. Finally if the lens is clear a foreign body may be seen in the vitreous or on the retina. In this case it can be localized by direct ophthalmoscopic examination. In many cases however it cannot be seen clinij cally. It may be behind the iris or in the ciliary body. If the lens is opaque it will be impossible to see a foreign body in the vitreous, | and for its proper treatment it will be necessary J to decide whether a foreign body is in the vitreous or in the retina or whether it is extraocular in the orbit. An attempt should always be made to remove a magnetic foreign body in the globe in order to prevent the subsequent I development of siderosis bulbi. If however a