. The anatomy of the human body. Human anatomy; Anatomy. THE CRYSTALLINE LENS AND ITS CAPSULE. G63 of the crystalline lens is almost equal. In the foetus the crystalline lens approaches the spheroidal form, which is that which it has in fishes. The anterior surface of the crystalline lens corresponds to the iris, from which it is separated by the aqueous humour. It has been incorrectly stated by Winslow that the crystaUine lens pushes the iris forward: there is a space between the crystalline lens and the iris which constitutes the posterior chamber of the eye. The anterior surface of the lens
. The anatomy of the human body. Human anatomy; Anatomy. THE CRYSTALLINE LENS AND ITS CAPSULE. G63 of the crystalline lens is almost equal. In the foetus the crystalline lens approaches the spheroidal form, which is that which it has in fishes. The anterior surface of the crystalline lens corresponds to the iris, from which it is separated by the aqueous humour. It has been incorrectly stated by Winslow that the crystaUine lens pushes the iris forward: there is a space between the crystalline lens and the iris which constitutes the posterior chamber of the eye. The anterior surface of the lens may be seen through the pupil, so that slight shades of difference in the col- our of the lens may be detected. When the pupil is very much dilated, the anterior sur- face of the lens is entirely exposed. Its posterior surface is in relation with the vitreous body, which is depressed so as to receive it. This surface does not adhere to the hyaloid membrane. When dissecting a subject of twenty-seven years of age who had suffered with hydrophthalmia in both eyes, M. Ribes found about six grains of a limpid fluid between the hyaloid membrane and the crystalline lens ; so that the space occupied by this fluid might have been taken for a third chamber. The margin of the lens {I, fig. 248) is set (like the stone of a brooch) in the ciliary pro- cesses (a) of the vitreous body, which cover and adhere to the fore part of that margin, so that the lens is kept firmly in its place. Its margin is surrounded by the canal of Petit {fig. 247). The crystalline lens presents different shades of colour at different periods of life. It is reddish in the fcetus, but is perfectly transparent after birth ; in the adult, it becomes slightly opaline at the centre ; in the aged, it acquires a yellowish opacity, which ap- proaches somewhat to the colour of amber or topaz. Morbid opacity of the lens consti- tutes lenticular cataract. The crystalline lens consists of a capsule, and of a proper substance
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