The usual classification of retinitis is by etiology, as for instance, retinitis syphilitica, diabetica, etc., and no doubt this division is the best for clinical purposes. In another sense or etiologic classification, one may distinguish between a primary and a secondary retinitis. In the first case the primary seat of the inflammation is the retina itself, while in the second case, the inflammation passes into the retina from a contiguous tissue—for instance, from the choroid. From an anatomic standpoint one may distinguish a retinitis interna from a retinitis externa according to the primary involvement of the internal or external layers of the retina ; or according to the class of inflammation, an alterative, exudative or proliferative retinitis. In the case of an alterative inflammation, degeneration of the histologic elements is predominant, as in retinitis albuminurica ; in exudative retinitis, the exudation at the surface is prevalent, as in purulent retinitis. The
FUCHS E. CLASSIFICATION OF RETINITIS. Arch Ophthalmol. 1930;3(4):393–402. doi:https://doi.org/10.1001/archopht.1930.00810060011001
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