It is obvious that not every disease of the eye found in a leper is caused by Hansen's bacillus. In corneal complications especially there is no agreement as to the extent to which the leprosy bacillus is the real excitor. Most authors believe that keratitis punctata superficialis, pannus leprosus and keratitis interstitialis leprosa are real manifestations of the disease, but others disagree. For instance, to quote only one example, van Driel1 stated that it is not yet certain whether or not keratitis punctata superficialis, so often seen in lepers, is of specific origin. He was impressed by his own observation of fifteen such cases among his patients with leprosy, of whom ten were completely healed within the short time of three months, which is not usual in other ocular manifestations of leprosy.
It is, further, uncertain up to the present whether these corneal diseases when occurring in nervous
PILLAT A. LEPROSY BACILLI IN THE SCRAPING FROM THE DISEASED CORNEA IN A LEPER AND COMMENTS ON KERATITIS PUNCTATA SUPERFICIALIS LEPROSA: REPORT OF A CASE. Arch Ophthalmol. 1930;3(3):306–317. doi:10.1001/archopht.1930.00810050058005
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