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Modification of Comberg's Contact Lens

Harvey E. Thorpe, M.D.

Arch Ophthal. 1944;32(6):497.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Comberg's roentgenographic method of localization of intraocular foreign bodies is extremely simple and accurate.

It consists of (1) placing a contact lens containing four lead markers on the cornea and (2) then taking a lateral and a posteroanterior view with the patient in the chin-nose position. From these two views all measurements can be taken and plotted on a sectional and an anterior view of the globe. The film measurements have to be reduced by a correctional factor of 10 per cent, this small distortion being due to the distance between the object and the film.

The Comberg contact lens has three inherent faults.

1. It is occasionally pushed downward by the upper lid, so that the contact lens and the visual axis are not coaxial.
   
2. Sometimes suction develops between the localizing (contact lens) shell and the eyeball, causing difficulty in removal of the shell.
   
3. It is fragile, being made of
   

Author Affiliations
Pittsburgh

Footnotes
Read before the Section on Ophthalmology at the Ninety-Fourth Annual Session of the American Medical Association, Chicago, June 15, 1944.

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