DISEASES OF THE EYE. 303 



being unimpaired they are enabled to keep with the flock and ex- 

 perience but slight difficulty in grazing. 



Simple Opbtbaltnia. 



Inflammation of the conjunctivae or mucous membranes lin- 

 ing the eyelids. It may be caused from foreign matter such as 

 hayseed or dirt gaining access to the eyes, or bites from insects. 

 It arises also as the result of exposure or as a complication of 

 nasal catarrh. 



Symptoms. 



The eye is partly closed, the eyelids are swelled, the eye is 

 retracted into the orbit, there is a copious secretion of tears which 

 flow down over the cheeks. On turning back the eyelid the con- 

 junctiva is found to be congested, with red streaks running 

 across it. 



When occurring as a complication in nasal catarrh it in- 

 vades the eye through the lachrymal duct. Should it attack the 

 cornea, exudation often takes place infiltrating the tissues of that 

 organ. The organization of this exudate produces a condition 

 known as opacity of the cornea. 



Creatrnciit. 



If due to the presence of foreign material this must be re- 

 moved, this in some cases is a matter of great difficulty, es- 

 pecially when the object becomes embedded in the tissues of the 

 eyeball, and in many cases it may be necessary to transfix the 

 membrana nictitans (winking eyelid) by means of a suture before 

 the particle can be abstracted. After-treatment consists in bath- 

 ing the eye with cold water and using some simple lotion, such as: 



Sulphate of zinc 2 grains 



Sulphate of morphia 3 grains 



Distilled water 1 ounce 



