A lecture of the anatomy, physiology, & pathology of the eye : which was delivered to the members of the City of London Medical and Chirurgical Society / by Thomas Firth.
- Firth, Thomas
- Date:
- MDCCCXXXI [1831]
Licence: Public Domain Mark
Credit: A lecture of the anatomy, physiology, & pathology of the eye : which was delivered to the members of the City of London Medical and Chirurgical Society / by Thomas Firth. 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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![far the cryfblline to move in, that objects r ,s be feen more diftinctly at different diftances The Crystalline Humour. Nexi.u the aqueous is the cryflalline humour, v™ is a tranfparent mafs refembling cryi u whence it takes its name. It is fituated u tween the other two humours, its ante 1 part being oppofite to and very r:ji the pupil ; its pofterior portion being lo , ed in a cavity formed for its receptioni]l the middle and fore-part of the vitreous 1 ,j, mour. The figure of the cryftalline is fjj of a lens, convex on both fides but rat , more fo pofteriorly. This humour, whicl j the leaft of the three, is of a much more £ confidence, particularly in the middle offll than either the aqueous or vitreous for t \ reafon it has fometimes been called the cryfl | line body. In the center or more comp [j, part, it feels like glue and may be eafily pr j fed into different forms; but it graduallyT comes of a lefs firm confiftence, fomewhat a thick jelly, towards the outer furface. time it is fubjedr. to change both its confifl and colour, growing fiill more firm, elpecia in the middle, and gradually taking a yellow; tins |](https://iiif.wellcomecollection.org/image/b21633873_0108.jp2/full/800%2C/0/default.jpg)
