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Home Medical and Vet Remedies, as Recommended by 19th and 20th century Doctors and Vets! |
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Home Medical and Vet Remedies, as Recommended by 19th and 20th century Doctors and Vets! |
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Cataract.A cataract consists in an opaque condition of the crystalline lens. It will be remembered that the lens of the eye is, in the natural condition, perfectly transparent; it lies just behind the colored ring called the iris, and fills up the black opening in the ring called the pupil. Yet so long as it remains healthy the lens is quite invisible, and v hen we look into the eye we see no object whatsoever filling up the pupil. When from any cause the lens loses its transparency and clearness and becomes opaque, it can be seen in the opening of .the pupil. This is what happens in the disease called cataract, which may be defined, therefore, as an opacity of the crystalline lens. Causes.-The opacity of the lens may be the result of anything by which its nutrition is impaired. These causes may be classified as follows : It may occur as the result of old age ; in advanced life the tissues of the body generally are not so well nourished as in earlier years. Changes occur in numerous organs ; the bones become more brittle ; the muscles are not so strong ; the skin is less abundantly provided with fat ; the hair loses its color and often falls out. The opacity of the lens in old age is merely one of the changes which seem to be due to the impairment of the powers of life ; this variety is called " senile cataract," because an accompaniment oi old age. Cataract may also result from some taint of the system whereby the nutrition of the body is interfered with. One of the most frequent examples of this is the condition known as diabetes. A patient suffering from d*°betes is very apt to become partially blind from an opacity of the lens-that is, cataract. The lens may also become opaque in consequence of some dis ease of the other tissues in the eye, for when certain of these structures- especially tne retina and the choroid - become diseased, there results a disturbance of the nutrition of nearly all parts of the eye. One of these results is an opacity of the lens. Cataract may also be produced by an injury to the eye, such as a blow, even though there be no wound. Finally, cataract is sometimes congenital-that is, an infant is born with opaque lenses. But first, if you want to come back to this web site again, just add it to your bookmarks or favorites now! Then you'll find it easy! Also, please consider sharing our helpful website with your online friends.
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