Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely.

  • Ely, Edward T. (Edward Talbot), 1850-1885
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    neal tissue. Suppuration may be limited, or entire cornea may be changed into yellow, necrosed mass. If suppuration is enclosed by corneal tissue it forms an abscess ; if superfi- cial, an ulcer. Sometimes sinks down between layers to lower margin of cornea, presenting appearance called onyx [Gr. owg, nail\, or unguis, [Lat. for nail,] from resemblance to lunula of finger-nail. If pus breaks through into ant. chamber, it forms hypopion, (p. 138 ). By oblique illumination, and looking at cornea in profile, it is generally easy to distin- guish between onyx and hypopion. Some- times both coexist. Suppurative process may be attended with vascularity and very acute symptoms, or there may be no ves- sels, and little or no irritation. Latter form specially dangerous from rapid death and sloughing of tissue. Abscesses may be absorbed or burst open, or pus may un- dergo fatty or chalky degeneration, leaving dense opacity. When abscess opens, an ulcer results. Ulcers also occur superfi- cially without precedent abscess. Are of variable size, shape and depth, and dan- gerous, according to situation and course. A very dangerous form is the crescentic mar- ginal ulcer, which shows tendency to encircle cornea and cut off nutrition of central parts. In small ulcers, extending to Descemet's membrane, latter may bulge forward through ulcer like a vesicle, forming keratocele or her-