On the development and abnormalities of the zonule of zinn / by E. Treacher Collins.

  • Collins, E. Treacher (Edward Treacher), 1862-1937.
Date:
[1892]
Catalogue details

Licence: Public Domain Mark

Credit: On the development and abnormalities of the zonule of zinn / by E. Treacher Collins. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    posterior part. The relation of the ciliary processes in the second case was also peculiar, for on one side of the sections they all passed behind the lens, being adherent to the mass on its posterior surface ; while on the opposite side they were arranged in their usual way, some in front and some behind. The lens thus appeared displaced for- wards, somewhat on one side. Nassaux* has figured and described a case veiy similar to mine, in which all the ciliary processes were behind the lens, adherent to the mass in which the hyaloid artery terminated. Grolmanf records a case of microphthalmos with a con- genital vascular cataract and persistent hyaloid artery, in which he pictures the ciliary processes as having adhesions to the fibro-vascular sheath of the lens. In a microphthalmic eye examined by Hessf there was a persistent hyaloid artery, dividing into branches in a membrane behind the lens, which latter was small and displaced upwards, there being a coloboma of the iiis downwards. The iris and ciliary processes above were adherent to the anterior face of the lens; below they turned backwards along the lower surface of a bundle of fibres, which was prolonged forwards through the coloboma from the membrane behind the lens. It would seem that when the central artery of the vitreous remains persistent and patent, the fibro-vascular sheath behind the lens also persists and becomes much thickened, and that the relation of the ciliary processes to the lens in some of these cases becomes altered, the latter being displaced forwards in front of them, between them and the iris. As the result of this they form adhe- sions entirely to the posterior part of the fibro-vascular sheath, and not any to its sides or anterior part. Con- sequently, as the globe expands, no lateral traction is exerted on the lens capsule, and the cells in the region of * Ai-chives d'Opht., T. 3, p. 502. t ArchiT fiir Oplitli., B. xxxy, Ab. ii, p. 187.. X ArchiT fill- Ophth., B. xxxiv, Ab. iii, p. 148