. Cyclopedia of farm animals. Domestic animals; Animal products. 438 HORSE HORSE in case the temperature rises. The limbs should be rubbed briskly with straw or the hands. Bleed- ing an animal affected with heat-stroke is a very bad practice and should always be discour- aged. Recovery is gradual and is prolonged over a week or two, during which time the animal should have general tonic treatment and be returned to heavy work gradually. Periodic ophthalmia (Moon blindness). Moon blindness is an ailment affecting the horse alone of all the domestic animals. It is an inflam- mation of the interi
. Cyclopedia of farm animals. Domestic animals; Animal products. 438 HORSE HORSE in case the temperature rises. The limbs should be rubbed briskly with straw or the hands. Bleed- ing an animal affected with heat-stroke is a very bad practice and should always be discour- aged. Recovery is gradual and is prolonged over a week or two, during which time the animal should have general tonic treatment and be returned to heavy work gradually. Periodic ophthalmia (Moon blindness). Moon blindness is an ailment affecting the horse alone of all the domestic animals. It is an inflam- mation of the interior of the eyeball, usually affect- ing only one eye at a time, one attack of which is almost sure to be followed by subsequent ones, and leading eventually to complete loss of sight. The exact cause of this disease is unknown. Various parasites have been said to be instrumental in its production, but none has been proved to have a direct causative effect. However, it is especially common in damp, marshy soils and seems to be especially prevalent after wet seasons. Heredity is also supposed to play some part in its production. This, however, is not positive, as foals from affected dams or sires, if taken to another locality, where the disease does not exist, may not be attacked. Animals are subject to the disease at any time of life, but the largest percentage of cases occurs in horses under six years of age. The disease appears very suddenly, sometimes over night. There is great irritation in the affected eyeball, sensitiveness to light and an excessive flow of tears, the eye being kept continuously closed, and drawn back into the eye socket. The conjunctiva or mucous membrane on the inside of the eyelid is very red, swollen, and may protrude between the closed lids. The blood-vessels around the eyeball are enlarged, and the eyeball is cloudy. After this has existed for a few days, healing usu- ally begins. The sensitiveness to light diminishes, and the excessive secretion of t
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