A practical treatise on the diseases of the eye / by John Vetch.

  • John Vetch
Date:
1820
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on the diseases of the eye / by John Vetch. Source: Wellcome Collection.

    21/284 (page 11)
    brane often preserves, for a length of time, its natural appearance; precisely the reverse takes place in the case of sclerotic inflammation, which invariably appears at the circumference of the cornea, forming a zone more or less complete around it, most conspicuous at the upper part, the form and colour of the vessels being at the same time wholly different from those which appear in the course of conjunctival inflammation. Intolerance of light invariably accompanies sclerotic inflamma¬ tion, and is entirely unconnected with that of the conjunctiva. When the force of the exciting cause produces any high degree of conjunctival ophthal¬ mia, the vessels at an early period endeavour to re¬ lieve themselves, by the usual changes induced by inflammation, and which being modified by the nature of the part, constitute the more specific symptoms of ophthalmia; the first effect is perceived in the increased and altered quality of the fluid, poured out from the external surface, a portion of the albuminous or coagu¬ lating constituent of the blood escapes, and is found floating in the lacrymal discharge; a far¬ ther increase of the inflammation occasions an effusion to take place from the interior or attached surface. The appearance which this spontaneous effort of the vessels occasions, is known by the term chemosis. The cornea becomes completely surrounded by the elevated conjunctiva; this c 2