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Defects of Sight; Their Nature, Causes, Prevention, and General Management

Defects of Sight; Their Nature, Causes, Prevention, and General Management


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: muscle, that the eyes are kept closed. It is also by the momentary action of the same muscle every now and then that winking is caused; overcoming the action of the levator muscle of the upper eyelid and the elasticity of the lower, it draws down the upper, and raises the lower eyelid considerably. Mechanism of the Lachrymal Apparatus, S.c. For the lubrication and protection of the delicate and sensitive borders of the eyelids, an unctuous matter is poured out on their surface by the minute mouths of the ducts of the Meibomian glands. These mouths may be seen on close inspection of the surface of the broad border of the eyelids, arranged in a row all along. The source of the tears is the lachrymal gland, which is situated above and to the outer side of the eyeball, securely lodged in a pit behind the edge of the socket. When the tears are poured out in unusual quantity, as they are in certain afiections of the mind, and in consequence of irritation of the eye from the intrusion of foreign particles or the like, they run over the margin of the lower eyelid, and drop down the cheek. A flow of tears in a less degree is, however, constantly taking place, by which the transparent front of the eyeball and the surfaces of the conjunctiva in general are washed and maintained in a moist state. The direction in which the tears flow over the surfaces mentioned, is from above and near the outer corner of the eye, where the ducts of the lachrymal gland open and discharge them, downwards to the inner corner, whence, as they accumulate, they are drawn off into the nose by the derivative lachrymal passages. At the termination of the firm border of each eyelid towards the inner corner, there is a slightly prominent papilla, with a small orifice at its point. These papillae are direc...


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Product Details
  • ISBN-13: 9780217829793
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 0217829791
  • Publisher Date: 20 May 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr


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