Eye injuries and their treatment . ubarachnoidalsheaths, and containing the retinal artery and vein. At the level of thesclerotic it becomes constricted, and its individual fibres pass through thecribriform plate devoid of their medullary sheaths, so that only nakedaxis cylinders enter the eyeball as the optic papilla. From this, theseexpand in all directions to form the retina or sentient tunic. To the outsideof the optic papilla and directly in the line of the visual axis is the shallowdepression that marks the yellow spot. The illustration also indicatesthe layer of rods and cones, and more
Eye injuries and their treatment . ubarachnoidalsheaths, and containing the retinal artery and vein. At the level of thesclerotic it becomes constricted, and its individual fibres pass through thecribriform plate devoid of their medullary sheaths, so that only nakedaxis cylinders enter the eyeball as the optic papilla. From this, theseexpand in all directions to form the retina or sentient tunic. To the outsideof the optic papilla and directly in the line of the visual axis is the shallowdepression that marks the yellow spot. The illustration also indicatesthe layer of rods and cones, and more indistinctly the nerve fibre andgranular layers of the retina. The cavity of the eyeball is divided by thecrystalline lens and its ligament into a larger posterior chamber filledby the vitreous, and a small anterior chamber containing the aqueoushumour. At the level of the corneo-iritic angle the canal of Schlemm andthe spaces of Fontana are clearly visible. The drawing represents theeye about four times the natural size. PIATE X. PENETRATING WOUNDS 6s disastrous, for they not only involve the cornea orsclerotic, but they generally also implicate the iris,ciliary body, and lens. Simple wounds of the corneaheal very rapidly. (Plate XL, Fig. i and 2.) Almostimmediately after an accident the cut edges becomecovered by a new development of epithelial cells,supported by glia tissue—Reid—(Plate XII.), and ifthis reparative process be not arrested, the woundwithin a very few days heals by first intention. Thisis seen to best advantag-e after incisions for surgicalpurposes, for then the union is oftentimes so perfect thatthe scar is visible only on careful examination. It isof the utmost importance, therefore, that the lips ofa corneal wound should come into accurate apposition,but this is frequently prevented by prolapse of the this have happened the fate of the eye depends,in most instances, on the skill with which the prolapseis treated. If it be recent, the iris is
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