United States or Christmas Island ? Vote for the TOP Country of the Week !
The vascular tunic may be congested in young infants, but atrophy soon develops and may reach an extreme degree. The sclera ordinarily becomes quite thin throughout, but may retain almost a normal thickness at the equator of the globe and posteriorly. Posterior sclera ectasae may develop.
A small shaving of the sclera, about ½ mm. thick, 1½ to 2 mm. broad and from 2 to 3 mm. long, is then excised by means of a narrow Graefe knife. The scleral slip is then freed from the conjunctiva at each end and the mucous membrane brought together over the wound by fine catgut sutures.
In acute glaucoma the sclera appears to be edematous and slightly thickened. As the disease progresses the sclera becomes denser than normal. The oblique openings passages for the venae vorticosae are said to be narrowed. The openings for the passage of the anterior ciliary vessels are enlarged in many, particularly in advanced cases. Minute herniae at these openings are sometimes present.
The commonest evidence of some form of consciousness persisting is probably to be seen in blinking when the eye is threatened or the sclera or cornea actually touched. A very large number of patients, when otherwise quite inactive, showed considerable response in their muscular resistiveness, the phenomena of which will be discussed shortly.
This is reached in woman rather suddenly and in man more gradually. The completely differentiated man differs from his completely differentiated mate in the texture of his hair, skin, nails; in the width and mobility of pupils, in the color of his sclera, etc., as well as in the more essential sex organs.
Aside from the dangers incident to a wide incision in the neighborhood of the ciliary body and the possibility of accident to the lens or vitreous body, or of intra-ocular hemorrhage, there is for the average operator the added difficulty and danger in removing a piece of sclera of the exact size required.
The conjunctival flap thus formed is turned back over the cornea, and the fragment of sclera that is left attached to the cornea is removed by means of a fine pair of delicate curved scissors. Following this an iridectomy is performed. The conjunctival flap is now replaced and a bandage applied.
As far as the Lagrange procedure is concerned, you will remember that after eserinization an oblique incision is made through the sclera by means of a narrow Graefe knife and a large conjunctival flap secured.
It goes without saying that the perineal region should be kept scrupulously clean. If any infections are to be avoided, eyes, nose and mouth should also be cleansed frequently. A patient who is so indifferent as to keep the eyelids open for such a long time that the sclera dry and ulcerate is also apt to let flies settle and produce serious ophthalmic disease.
This is obtained by making a peripheral section of the sclero-corneal margin with the knife and, as soon as the edge of the knife reaches the upper limit of the anterior chamber, it is turned backward and brought out through the sclera obliquely.
Word Of The Day