. Diseases of the dog and their treatment. ping in this condition. Frohnerthinks that the lens becomes saturated with grape-sugar, which is present DISEASES OF THE CRYSTALLINE LENS 417 in diabetes, and the lens undergoes a retrogressive metamorphosis dueto disturbance of its nutrition. There is no doubt that cataract is also caused by inflammatory-processes of the eye, and the nutritive supply of the lens becomes dis-turbed and its normal condition impaired, such as ulcerations of thecornea with central perforation, inflammation of the meml^rane of thelens and iris, and also bleeding into the
. Diseases of the dog and their treatment. ping in this condition. Frohnerthinks that the lens becomes saturated with grape-sugar, which is present DISEASES OF THE CRYSTALLINE LENS 417 in diabetes, and the lens undergoes a retrogressive metamorphosis dueto disturbance of its nutrition. There is no doubt that cataract is also caused by inflammatory-processes of the eye, and the nutritive supply of the lens becomes dis-turbed and its normal condition impaired, such as ulcerations of thecornea with central perforation, inflammation of the meml^rane of thelens and iris, and also bleeding into the anterior chamber. Injuriesof the lens and concussions of the eye also cause a number of cases ofcataract. Certain conditions are developed as the result of concussion of theeye and appear quite frequently; they may be thus briefly described:The lens either sinks downward with the capsule or becomes laterallydisplaced. It may lean against the iris or it may drop forward intothe anterior chamber of the eye, and it may finally crowd into the. Fig. 142.—Gray cataract of both eyes. vitreous humor. If the lens has undergone but slight displacement(subluxation), it may remain clear for some time, but the vision ismuch impaired. If it has fallen into the anterior chamber or has beenforced into the vitreous humor, we see a rapid development of thecataract, and in the later stages considerable inflammation of the choroidmembrane of the iris, or of the whole eyeball. Clinical Symptoms.—In cases where the disease is somewhat ad-vanced, and the cataract is fully developed into one of the followingforms—punctiform, streaked, spotted, or complete opacity of a whitish-blue, brownish-blue, or mother-of-pearl color—it is easily recognized(Fig. 142); but, on the other hand, where there is a mere cloudy dimnessand small spots of cataract, we must use candle-light or some illumi-nating power such as an ophthalmoscope and a strong light to see the27 418 DISEASES OF THE EYES action of the len
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