Cataract; its nature, symptoms & cure. With reference especially to the restoration of sight, by a peculiarly mild and successful operation, applicable to every variety of the disease, in its early as well as its late stages, and at any period of life. Illustrated with cases ... / [John Stevenson].

  • John Stevenson
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: Cataract; its nature, symptoms & cure. With reference especially to the restoration of sight, by a peculiarly mild and successful operation, applicable to every variety of the disease, in its early as well as its late stages, and at any period of life. Illustrated with cases ... / [John Stevenson]. Source: Wellcome Collection.

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    arising from hysterics, the sympathy of the eye with a disordered state of digestion, as well as from ocular spectra—the result of a derangement in the function of the retina or optic nerve—namely, visual hal¬ lucinations, or the ideal perception of black specks, flashes of light, dust, cobwebs, and other fantastic and imaginary objects, which, to the deluded apprehension of the patient, float before him in the circum¬ ambient air, and interrupt his sight. The affected organ becomes also at an early period myopic*, or near-sighted : viz. the field of vision is contracted, shortened, or restricted within narrower bounds, the afflicted being capable of discovering even near objects with only comparative ease and accuracy, the more distant appearing as if involved in a cloud or fog, which renders them very imperfectly distinguishable. This defect is probably owing to the in¬ creased density or more impervious con¬ dition of the lens, and produces the same effect as if the sphericity of the eye itself were actually augmented. At all events, on * A Greek word signifying “ mouse-eyed or mole- eyed.”
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