A complete physico-medical and chirurgical treatise on the human eye / [Peter Degravers].

  • Degravers, Peter
Date:
1788
Catalogue details

Licence: Public Domain Mark

Credit: A complete physico-medical and chirurgical treatise on the human eye / [Peter Degravers]. Source: Wellcome Collection.

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    f9 the tarfus. When they take rife in the internal edge, tills diforder is called tricbiafs. The brufhing which happens upon the globe tarnifhes the cornua, and inflames the conjunctiva* In the internal angle upon the end and edges of the tarfi, are two little holes, one at each eye-lid, called punfta lacrymalia ; each has a fpinfter which contrafts and dilates it.felf, and their drifts have a vermicular mo- tion, which is repeated at each winking, what help? the paflage of the tears into the faccus lacrymalis, and from thence through the dufius adnafum into the noftriL Jane Gilchrift, who was in the Edinburgh Infirmary about November 1786, has three punfta lacrymalia to her right Eye only, two inferiors, and one fuperior. The inferior punfta are very diftinft, and diftant from each other of half a line ; they have each a diftinft duct, which extends to the common duft. I palled two fmall probes at the fame time, to convince me that there was no communication of the clufts until all three were ending at the common duft. She was troubled with a violent inflammation, but not on account of thefe punfta lacrymalia and ducts, as fhe never had bad Eyes till fhe came at the age of feventeen. The lacrymal ducts are formed by a mufcular mem- brane, whofe fibres are ftraight, and thofe of their fphincters interwoven. Thefe dufts join together a little before they communicate with the faccus lacry- malis, under the commiflure of the internal angle, to form but one duft, which is adapted to the lacrymal fac, to pour out the tears into it. The faccus lacrymalis is an oval, irregular, and a lit- tle flatted bag, or refervoir ; it is made up of a Ipongi- ous membrane, interwoven with fibres, blood veflels, and a great many fmall glands, through which flow an excretory humor more vifeous than the tears: it is C Z lodged
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