Title: Pathology and bacteriology (electronic resource)
Identifier: b21287442 (find matches)
Year: 1911 (1910s)
Authors: Collins, E. Treacher (Edward Treacher), 1862-1937; Mayou, M. Stephen (Marmaduke Stephen), 1876-1934; Pyle, Walter L. (Walter Lytle), 1871-1921, editor; University College, London. Library Services
Subjects: Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye
Publisher: London : William Heinemann
Contributing Library: UCL Library Services, University College London (UCL)
Digitizing Sponsor: Jisc and Wellcome Library

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5S8 PARASITIC DISEASES AFFECTING THE EYE tributed will likewise be rendered functionless. Marked secondary pigmentation of the retina follows, from the proliferation and migration of the pigment cells. The white areas surrounded by pigment seen ophthalmo- scopically are due, partly to exposed sclerotic from atrophy of the chorio-capillaris, and partly to newly formed fibrous tissue.
Text Appearing After Image:
Fig. 253.—Section of the coats of the eye showing the degenerative and pigmentary changes left in the retina as the result of a patch of syphilitic chorio-retinitis. The retina may be affected secondarily to the choroid as has already been described, or the spirochaeta pallida may be primarily deposited in it. As in all metastatic lesions of the retina, this is more likely to take place in the neigh- bourhood of the disc where it is most vascular. The papilla also is usually involved, producing a condition of neuro- reti- nitis. The swelling and pressure of the exudation in the papilla, accompanied by inflammation in the vessel walls, will sometimes cause secondary thrombosis of a retinal vein. Lacrymal obstruction is a frequent sequela of the rhinitis of congenital syphilis, which causes periostitis and thicken- ing of the bony wall of the lacrymal canal.

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