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

  • John Vetch
Date:
1820
Catalogue details

Licence: Public Domain Mark

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

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    ally succeeds is the most excruciating that can be imagined.* The colour of the tumor is uniformly blue; as this is neither the colour of the iris nor of the sac, it is not easy to explain the cause on which it depends. At the more advanced stage of its growth, the sac may not only be punctured with impunity, but the evacuation of the aqueous hu- mour which it contains is often required to relieve the pain which its distention brings on, especially in damp weather. In such cases the sac itself, when lying upon the blade of the knife or lancet, is perfectly transparent, and unconnected with the iris, while the water which it contains is the same in all its properties with that contained in the chamber of the healthy eye. | Although the staphyloma when completed should extend over two-thirds of the pupil, that portion of pupil which remains behind the sound cornea ‘suffers no kind of distortion, and is capable of a small degree of contraction and dilatation, though for the cause I have already noticed it does not serve the purpose of vision. The iris adheres to the tumor at each side, and that portion of it which remains beneath the sound cornea, whether * Asa general observation this is correct; yet there are cases’ where the incipient staphyloma has been cut off with the acissars, with the happy result of disengaging the entangled portion of the iris. |
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