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January 1968

Practical Characteristics of Ophthalmic Magnets

Author Affiliations

Southampton, NY
From Southampton Hospital, Southampton, NY.

Arch Ophthalmol. 1968;79(1):22-27. doi:10.1001/archopht.1968.03850040024008

Failure to extract a magnetic intraocular foreign body is often due to a misunderstanding of the pulling force of a magnet, which is not its field strength in gauss, but rather the product of the field times the field gradient. New equipment allows this pulling force to be plotted and the strength of different pole-tip shapes to be determined.

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