Applanation Of The Cornea
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Applanation of the cornea is the flattening of the cornea, typically resulting from extensive penetrating ulcers and injuries that cause iris prolapse with decreased intraocular pressure, and after cataract extraction complicated by vitreous prolapse. It can also develop without corneal perforation due to inflammation of the deeper layers of the cornea, such as after parenchymatous keratitis or in severe cases of deep keratitis with iridocyclitis.
Encyclopedia entry (1928–1936)
APPLANATION OF THE CORNEA (applanatio corneae), flattening of the cornea, usually develops as a result of extensive penetrating ulcers and injuries to the cornea that cause iris prolapse with decreased intraocular pressure and after cataract extraction complicated by vitreous prolapse. A. can also develop without perforation of the cornea on the basis of inflammation of the deeper layers of the latter: after ordinary parenchymatous keratitis (rarely); in severe cases of deep keratitis, with iridocyclitis, after the spread of inflammation from the cornea to the ciliary body with subsequent decrease in intraocular pressure. Vossius observed A. of the cornea after a lime burn to the eye with its deposition in the cornea, but without perforation of the latter. In corneal applanation, the anterior chamber is very shallow, vision is greatly reduced due to changes in refraction (hypermetropia, astigmatism) and clouding of the cornea.
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Cite this page
“Applanation Of The Cornea.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/applanation-of-the-cornea/