On squinting, paralytic affections of the eye, and certain forms of impaired vision / by Carsten Holthouse.

  • Holthouse, Carsten, 1810-1890.
Date:
1858
Catalogue details

Licence: Public Domain Mark

Credit: On squinting, paralytic affections of the eye, and certain forms of impaired vision / by Carsten Holthouse. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    SECTION III. ON ASTHENOPIA. The terms impaired vision, intermittent vision, weakness of sight, asthenopia, have been applied to a defect of sight which is characterised by an inability to keep np any sustained effort of vision. “ The power of vision,” observes Lawrence, “ is not impaired; the minutest objects are seen clearly as in the natural state of the eye. But when it has been exerted for some time, the organ becomes tired; objects appear dull, con- fused, or distorted, and can no longer be recog- nised ; a sense of weariness comes on in the part, occasionally with redness and lachrymal suffusion. The eyelid drops, and a painful pres- sure is felt in the brow. The uneasiness goes off by rest, the powers of the retina are restored, and the eye may be employed again; but if exertion be imprudently pursued the organ becomes sooner tired. The time in