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The author has prefaced the clinical part of his book with a study of the physiology and pathology pertaining to the subject. He recalls the importance of the work of Parinaud, who established the rôle of the visual purple, and who was the inspiration of much subsequent investigation.
Then, from the clinical point of view, he classifies the etiologic forms of the condition.
MAJOR HEMERALOPIAS. Among these, which are characterized by the magnitude of the visual impairment, are distinguished :
"Essential hemeralopias" (so-called), which include: 1. a hereditary type 2. an acute type
Disease of Truc-Nettleship-Capion. This disease is familial, hereditary and congenital, and is a true "night blindness," vision and orientation being normal in the daytime or under artificial light and absent in diminished illumination. It is apparently localized geographically, one type being known by the name "Vendémian" (a commune near Montpellier), the
Bruce GM. L'amblyopie crÉpusculaire. Classification de ses formes Étiologiques. Arch Ophthalmol. 1930;4(3):442–445. doi:10.1001/archopht.1930.00810110156020
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