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SMALL foreign bodies in the vitreous chamber which are entangled in the retina and choroid or embedded in the sclera are often not pulled loose with the magnet unless it is applied close to or directly over the foreign body.
The danger is that the foreign body may be incorrectly considered nonmagnetic after a number of unsuccessful attempts to remove it.
The case reported here is one in which this error was made.
J. L. A., a mechanic aged 38, was first seen Oct. 6, 1933. The day before, he had been pounding a piece of metal with a hammer and something flew up and struck him in the left eye. Examination showed vision of 20/15—1 in the right eye and 20/15—3 in the left eye. The conjunctiva was congested, but no wound was seen in the conjunctiva or cornea.
On ophthalmoscopic examination a metallic-looking foreign body was clearly
ATKINSON WS. EXACT SURFACE LOCALIZATION OF OPHTHALMOSCOPICALLY VISIBLE FOREIGN BODIES IN THE VITREOUS CHAMBER. Arch Ophthalmol. 1947;38(1):110-111. doi:10.1001/archopht.1947.00900010113008