The refraction of the eye : a manual for students / by Gustavus Hartridge.

  • Gustavus Hartridge
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: The refraction of the eye : a manual for students / by Gustavus Hartridge. Source: Wellcome Collection.

    110/272 (page 90)
    out atropine wearing the riglit correction; and tlie inconvenience entailed upon tlie patient for two weeks by its use, is not to be compared to tlie trouble and astlienopia from wbicb lie or she is so liable to suffer, if tbe glasses worn are not the proper ones. In old persons with small pupils, in whom it is difficult to see the movements of the shadow, and in whom solutions of atropine of the ordinary strength are dangerous, on account of the occasional occurrence of that much dreaded disease glaucoma, which has been clearly traceable to its use, I have often found it convenient to dilate the pupil with homatropine in solution, gr. ij to *] of water, or with an exceedingly weak solution of atropine gr. to jj of water. I will now briefly describe two modifications of retinoscopy which have been suggested and carried out. First, Mr. Story has proposed the use of a plane mirror, in the place of the concave one already de- scribed, it certainly possesses several advantages and is preferred by many surgeons. With it the movements of the shadow are in the same direction as those of the disc and blood-vessels, as seen by the direct ophthalmoscope at a distance from the eye (page 60), viz. in the same direction as the observer's movements in hypermetropia, and in the opposite direction in myopia. No additions or subtractions have to be made to the glass found by this method. The disadvantage is, the distance at which the observer must work, viz. 4-5 metres from his patient.