Observations on miners' nystagmus and its cause; congenital ocular defects; and other papers / by Simeon Snell.

  • Simeon Snell
Date:
1884
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Licence: Public Domain Mark

Credit: Observations on miners' nystagmus and its cause; congenital ocular defects; and other papers / by Simeon Snell. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    Benson, and, moreover, in the * Annales d’Oculistique * for the present year,* Van Duyse had added another to the list. In Benson’s and Van Duyse’s cases both eyes were affected, and the same was the case in one of Neiden’s. In one eye of the case reported by Benson, the size of the coloboma is given as being equal at least to six times the size of the papilla; in mine I believe it was larger. In the cases reported by Neiden and Van Duyse it was much smaller. The latter observer mentions the size of the coloboma as being at least equal to three disc diameters in the right, and in the left to two. In Neiden’s first case, in the right and left eye respectively the size is given as twice and two and a half to three times, and in another it is two to three times the diameter of the papilla. One of Neiden’s cases occurred, like mine, in a microphthalmic eye. The condition observed in the right eye must also, I believe, be considered to be congenital, and to be occa- sioned by arrest of development. Coloboma of the choroid, without accompanying cleft in the iris and ciliary body, has been described, among others, by Benson. The condi- tion in this instance is interesting in connection with the coloboma of the optic nerve-sheath in the opposite eye. Coloboma of upper eyelid.—The subject of this defect is a young woman, get. 26 (June, 1883). She is an only child. Enjoys good health, and has no other deformities ; the same remark applies to her father and mother. She is married, and has given birth to three healthy, well- formed children. The “ cleft ” is in the left upper eyelid, and is situated at the junction of the inner with the middle third. It hardly extends to as much as a third of the depth of the eyelid ; it is particularly noticeable when the eye is closed, as a distinct notch is then left. From the termination of the “ cleft ” a well-marked ridge (raphe) extends upwards in the eyelid almost to the orbital margin. The eyeball is * Mars and Avril, 1884, p. 117.
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