The principles and practice of ophthalmic medicine and surgery / By T. Wharton Jones. With one hundred and ten illustrations.
- Jones, Thomas Wharton, 1808-1891.
- Date:
- 1856
Licence: Public Domain Mark
Credit: The principles and practice of ophthalmic medicine and surgery / By T. Wharton Jones. With one hundred and ten illustrations. Source: Wellcome Collection.
Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.
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![great dissipation on the retina, so that this is extensively illumi- nated. The observer's eye D looks through a hole in the middle of the convex mirror. The ophthalmoscope of Ulrich is constructed on a similar plan, hut is more compactly arranged. Anagnostakis's ophthalmoscope is merely the concave mirror (four and a half inches focus). Jaeger's ophthalmoscope, ■which appears to be very compact and convenient, may be adjusted with either a plain or a concave reflector on Helmholtz's or Kuete's principle. The use of the ophthalmoscope is necessarily limited by the capa- city of the eye to bear the light. For the examination of the eyes in children, especially when affected with intolerance of light and blepharospasms, considerable management is required, and even some degree of gentle force. The surgeon is to seat himself on a chair, with a towel folded longways, laid across his knees. On another chair, on the sur- geon's left hand, and a little in front of him, the nurse, with the child, sits in such a way that when she lays the child across her lap, its head may be received on the towel, and between the knees of the surgeon, and thus held steadily. The nurse now confines the arms and hands of the child, whilst the sur- geon, having dried the eyelids with a soft linen cloth, proceeds to separate them by applying the point of the forefinger of one hand to the border of the upper eyelid, and the point of the thumb of the other hand to the border of the lower, and then sliding them against the eyeball, but without pressing on it, towards their respective orbital edges. This mode of proceeding obviates the eversion of the eyelids, which is so apt to take place under the circumstances. The eyelids being thus opened, they are readily kept so during the examination, by the command which the points of the finger and thumb, resting against the edges of the orbit, have of their borders. By this means the whole front of the eyeball is exposed, but it often happens that, to avoid the light, the eye is spasmodically turned up, so that the cornea is in a great measure concealed. By waiting a few seconds, however, enough of it will in general come into view to enable the surgeon to judge of the state in which the eye is. Having completed this part of the exploration, there is not much difficulty in so everting the eyelids, as to ascertain the state of the palpebral conjunctiva. [The eyes of an infant may be most readily examined while the child is asleep. Time enough is generally afforded for a good view of the cornea and conjunctiva before the little creature is alarmed.] State of the white of the eye—ocular conjunctiva.—The ocular conjunctiva is connected to the sclerotica underneath by cellular](https://iiif.wellcomecollection.org/image/b21018339_0064.jp2/full/800%2C/0/default.jpg)
