DISEASES OF THE EYE. 521 



If the cornea becomes cloudy, apply the following lotion morning and 

 night, with a camel's hair brush. 



No. 82, 10 Grains nitrate of silver, 



1 Ounce water, 

 Mix. 



Apply lotion No. 80, six to eight times a day, with a camel's hair 

 brush, all around under the eyelids and upon the eyeballs, to prevent 

 the extension of the inflammation to the inner parts of the eye, or to 

 alleviate it, if this has occurred. Give the animal rest, with soft feed and 

 a dark stall. 



m. Amaurosis, Gutta Serena, or Glass Eye. 



This is blindness from paralysis of the optic nei-ve (the nerve of the 

 sense of sight) and retina. The latter is the expansion of the optic nerve 

 over the back of the chamber of the eye. There is no alteration in the 

 structure of the eye, but simply loss of power to see. The pupil is greatly 

 dilated, indicating the eye's insensibility to light, and has a very clear, 

 bright appearance, like blue glass ;and instead of contracting and expand- 

 ing, as it should do, in different degrees of light, it remains fixed. 



Cause. — It may depend upon injury to the brain, with effusion press- 

 ing on the optic nerve, and when this is the cause, the appearance of the 

 eye above described will be noticed. Or it may result from excessive 

 fever in any disease, and especially epizootic influenza, if the temper- 

 ature of the body runs above 106 ® . In the latter case, the retina is 

 involved in the iiiflammation, loses its beautiful bluish lustre, and be- 

 comes whitish-green in color, and the humors (the liquids) of the eye 

 get more or less muddy, and give a greenish cast to the whole eye. 



As this condition may not be detected by 

 a casual observer, by looking into the eye 

 itself, it is necessary to notice closely the 

 actions of the horse. It may effect one or 

 both eyes. If only one, the horse's action 

 may not be altered, but if both eyes are blind 

 the fact Avill be betrayed by his high stepping 

 and his constant moving of the ears forward 

 and backward. These are indications which 

 should always create suspicion in this re- 



•^ EYE AFFECTED BY SERENA. 



spect. 



What to do. — Apply a blister. No. 9, to the cheek or temple, and 

 on the back of the neck, and give internally Nos. 67 and GQ in alterna/ 

 tion. But a cure is rarely to be hoped for. 



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