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In modern industry, in which instruments and tools of great power are in use, piercing lesions of the eyeball frequently occur. After the foreign body has passed through the wall of the eye in its anterior or anterolateral section, it still retains sufficient kinetic energy to enter the orbital cavity on its way through the vitreous and the posterior wall of the eyeball.
In rare instances such a foreign body may perforate the osseous wall of the orbit and enter the brain.
Perforating lesions of the eye or so-called double perforations of the eyeball (Hirschberg) differ considerably from the usual piercing injuries in their clinical evolution.
There is, however, practically no classification of these lesions in common use. In the articles and descriptions dealing with individual cases the authors have given arbitrary explanations of these facts. Some have accepted the indications of Hirschberg and regard as perforating lesions only
MEDVEDEF NI. DOUBLE PERFORATIONS OF THE EYEBALL: A CLASSIFICATION. Arch Ophthalmol. 1938;19(2):224–228. doi:10.1001/archopht.1938.00850140066007
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